Types of Interlining in Garments and How to Select the Right One
A shirt collar that stays crisp wash after wash, a jacket lapel that rolls cleanly, a waistband that holds its shape — none of these happen by accident. In each case a hidden layer is doing the structural work: the interlining. Choose it well and nobody notices it. Choose it badly and the customer notices nothing else — bubbling on a collar, glue showing through a blouse, a lapel that goes wavy after the first wash.
This guide explains the types of interlining in garments, how fusible interlining works, how to select the right construction for each part of a garment, and — the part most guides skip — how a buyer should check delivered interlining and attribute faults when something goes wrong.
What Is Interlining?
Interlining is a textile material attached to, or inserted within, selected areas of a garment to provide support, stability and shape retention, protecting the outer fabric against distortion in production, wear and aftercare. Interlining is also called interfacing in some apparel markets, particularly in US terminology. Fused to the shell fabric, it acts as a composite that stabilises the shell, improves the appearance and hand feel of the laminate, and helps the fused part keep its shape and last longer. That definition frames every selection decision that follows: interlining is not decoration, it is engineering. It is used wherever a garment needs local structure — collars, cuffs, plackets, waistbands, lapels, pocket flaps — and one garment may carry several different interlinings, because each component asks for a different balance of stiffness, flexibility, weight and wash resistance.
Interlining vs Lining: The Difference in One Table
Buyers and new merchandisers often confuse the two, because both sit inside the garment. The distinction is functional.
| Interlining | Lining | |
|---|---|---|
| Position | Attached to the wrong side of a shell-fabric component, or inserted between shell layers | Under the garment, covering raw edges |
| Purpose | Strength, support, stability, shape retention | Neat finish, smooth surface, good drape |
| How it is fixed | Fused with heat and pressure, or sewn in as a separate layer | Sewn in as a separate layer |
| Typical example | Fusible interlining in a shirt collar and cuff | Lining fabric inside a girl’s frock or a jacket body |
If a collar collapses, the problem is almost never the lining.
The Three Base Fabrics: Woven, Knitted and Nonwoven Interlining
Interlining is classified two ways: by base-fabric structure, and by whether it is fusible or non-fusible. The base gives three types — woven, knitted and nonwoven — each with a different mix of strength, flexibility, weight and cost. The base fabric is the first selection decision; the adhesive is the second.
Woven Interlining
Woven interlining is the oldest type: originally 100% cotton made stiff with starch and non-fusible, fusible versions came later, in which cotton sheeting is coated with adhesive that bonds to the shell fabric under heat and pressure. Modern woven interlinings are still mainly 100% cotton, thread density matched to the weight or stiffness required, with poly-cotton blends to deal with cotton’s shrinkage. Weaves are mostly plain, with crepe, herringbone or twill for specific uses. The main advantage is strength and stability — the waistband is the classic example — and the main disadvantage is the same property where flexibility and a soft hand feel are required, although texturised polyester yarns can add volume and softness. Woven interlining can cost more than some knitted or nonwoven alternatives, making it less attractive for price-sensitive garments, which is one reason knitted bases replaced it in many uses. For buyers comparing bases, the difference between knit and woven fabric matters here too: the same stability-versus-stretch trade-off governs shell fabrics and interlining bases alike.
Knitted Interlining
Knitted interlining answers the woven base’s weaknesses in flexibility, light weight and soft handle. Loop structures give flexibility and stretch with body and stability, while fine bulked (texturised) filaments keep the laminate light and soft. Knitted interlining is often selected for applications where its flexibility and drape justify its additional cost, so it is used mainly in high-value garments such as blazers and high-fashion blouses. Where woven interlining would make a jacket forepart feel board-like, knitted interlining gives body without rigidity.
Nonwoven Interlining
Nonwoven interlining is formed by arranging fibres or filaments into a web and bonding that web mechanically, chemically or thermally, which removes the cost of spinning and weaving the base. With no yarn interlacement, the web lacks the strength apparel use requires, so strength is added by bonding. Nonwovens are the most versatile of the three types, available in indicative commercial weights from 10 gsm to 200 gsm and above, mostly from synthetic fibres formed into a layer and bonded. Common web-forming approaches include spunlaid, wetlaid and drylaid processes, with variations such as airlaying. Weight is a key specification — a 10 gsm nonwoven and a 200 gsm nonwoven are different products for different jobs; see our guide to fabric GSM and specifications. India has a national specification for this category: IS 12806:1989 specifies requirements for nine varieties of nonwoven fusible interlinings for garment use (the edition consulted for this article), and warns against delamination, which leads to poor abrasion and washing resistance.
Fusible vs Non-Fusible Interlining
The second classification is by application: non-fusible interlining is sewn in as a separate layer, while fusible interlining carries a thermoplastic adhesive, usually applied as dots or a scatter coating, that bonds to the shell fabric under heat and pressure in a fusing press. Fusible interlining dominates modern production because it is faster and more consistent than sewing in a separate layer — but temperature, pressure, time and adhesive must all match the shell fabric and the care regime the garment will face.
HDPE and PA are two commonly discussed adhesive families in fusible interlining. Other adhesive chemistries are also used, so the two below do not exhaust modern fusible-interlining adhesive technology. Their trade-offs are summarised below, from the comparison table in the Online Clothing Study guide, with corrections from our verification work noted underneath.
| Property | HD-PE adhesive | PA adhesive |
|---|---|---|
| Bond strength | Good bond strength on a wide range of fabrics | Good on a wide range of outer fabrics; sometimes inferior on synthetics and specially finished fabrics |
| Washability | Excellent washability up to 95°C; suitable for garment dyeing | Good at 30–60°C; MV-type PA only to 40°C (source table figure) |
| Steam behaviour | No reaction to steam; no steam strike-back | Strong reaction to steam; prone to steam strike-back; steam lowers its melting point |
| Fusing | No steam or high-frequency fusing; needs high fusing conditions | Easy to fuse; no Teflon-belt contamination on continuous presses |
| Drawbacks to watch | Heavy contamination of Teflon belts; high fusing conditions | Strike-through possible on lightweight fabrics; scatter coating can harden the handle |
Indicative performance ranges reported in the cited technical source; these are not universal limits for all products. Confirm every figure against the supplier’s technical data sheet for the specific product.
Three qualifications matter. First, the source prints “950C”, which appears to mean 95°C. This interpretation is consistent with patent literature describing shirt interlining that must withstand washing up to 95°C, with HDPE (melt range from about 130°C) as the adhesive typically used — in the background discussion of US Patent 8,603,926. Second, the PA steam strike-back problem is corroborated independently: US Patent 5,439,737 describes a specific polyamide-containing, two-phase adhesive system developed to reduce or eliminate steam breakthrough, and gives the melting-point range of the disclosed thermoplastic polymers as 80–130°C — the polymers being polyamides and polyesters, alone or mixed, so the range is not a melting point for the polyamide powder alone, nor for all PA adhesives. Third, the 40°C limit for MV-type PA adhesive appears only in the source table — confirm it against the supplier’s technical data sheet before specifying it. The practical rule: an appropriately formulated and tested HDPE-based adhesive may be suitable for high-temperature washing and garment dyeing, PA where easy fusing and steam pressing matter and wash temperatures stay moderate — and never select an adhesive without the garment’s care-label wash temperature in front of you.
How to Select the Right Interlining: The Fusing Test Request
Selection is a test, not a catalogue choice. The established procedure is to complete a Fusing Test Request and ask the interlining supplier to run a fusing test on the actual shell fabric — preferably on the factory’s own equipment — and submit a test report after an agreed number of washes, according to the garment’s expected care life, intended market and care-label conditions. The 5, 10 or 20 wash counts in the source article are the author’s suggestion, not a general requirement in ISO 6330 or in the patents cited. A request should record the factory, buyer and country, style, material content (with 1–2 metres of original finished fabric supplied — state the usable width and the number of pieces required), item, care instruction, application area (collar, neckband, placket, cuff), press model and test method.
The supplier’s report should identify the agreed separation-force test method and revision, specimen width, test conditions, and bond-strength values after fusing and after washing, with samples after fusing and after the agreed wash cycles for appearance and hand-feel reference. One caution: the source article’s sample form lists “IS-1259” as the test method, but this designation should not be copied into an interlining specification. IS 1259:2022 is titled Vinyl Coated Fabrics — Specification. It is a standard for coated fabrics and has nothing to do with interlining. Name the bond-strength test method you actually agreed with the supplier, record the exact washing and drying procedure selected under ISO 6330:2021, including the machine type, washing procedure (ISO 6330:2021 provides 16 Type A, 12 Type B and 7 Type C washing procedures, plus six drying procedures — it is not a single universal wash) and drying procedure, and keep the report with the style file. A test whose method is not recorded cannot be repeated, and a result that cannot be repeated cannot settle a dispute.
Without a supplier test, judge the fused sample on five things: no bubbling or unevenness after washing; no hardening of the hand feel; no visual change such as a wavy moiré effect or colour change (a known risk with woven interlining or linear dot patterns on light, open-texture fabrics); no shiny glue dots visible on the face; and, for sheer fabrics such as georgette or chiffon, an interlining colour matching the base colour rather than a contrasting white, black or charcoal. For small areas stitched closed on all sides, the source author’s suggested range is 5–7 N per 50 mm-wide strip for certain small areas stitched closed on all sides — the author’s rule of thumb, not a standard, and a force value without a stated test method, specimen preparation, peel mode and test speed cannot be independently reproduced. Its order of magnitude matches the background discussion in US Patent 6,986,935, which cites earlier interlining systems with separation-force values below 10 N/5 cm, falling further after washing — a historical comparison, not an acceptance value. Agree the value for each style with the supplier, in writing, with the test conditions recorded.
Quick-Selection Table by Garment Part
Selecting by base-fabric type alone does not tell a merchandiser what to order for a collar versus a waistband. This table is a starting point for discussion with a supplier, not a specification — confirm every choice with a fusing test on the actual shell fabric.
| Garment part | Usual first choice | Why | Watch out for |
|---|---|---|---|
| Shirt collar and cuff | Woven fusible, HD-PE adhesive | Maximum stability and crispness; hot-wash resistance | Bubbling after washing; stiffness that feels board-like |
| Placket and neckband | Woven or nonwoven fusible | Stability along a narrow, high-stress strip | Strike-through on lightweight fabrics; colour show-through |
| Waistband | Woven fusible | Strength and stability under tension | Shrinkage mismatch with the shell fabric |
| Jacket lapel and forepart | Knitted fusible | Body and drape without rigidity; soft hand feel | Cost; loss of shape if the adhesive is under-fused |
| Pocket flap and stays | Light nonwoven fusible | Light, cheap, adequate for low-stress parts | Delamination; poor wash resistance in heavier weights |
| Lightweight blouse (georgette, chiffon) | Light nonwoven fusible, colour-matched | Minimal added weight; no visible contrast | Glue dots visible on the face; moiré effect from dot patterns |
Buyer Acceptance: Checking Delivered Interlining Before It Reaches the Cutting Table
This is the part the competing guides do not cover. A supplier’s laboratory report describes the interlining the supplier tested — not the rolls that arrived at your factory. A buyer-side incoming inspection closes that gap, and it is cheap: a fusing press, a washing machine, a peel test and a form. Run it on every new lot, and on a sample of every repeat lot.
Incoming-inspection checklist for a delivered interlining lot. Select rolls according to a documented incoming-inspection sampling plan. For initial verification, include at least two rolls — but two rolls out of a lot of four and two rolls out of a lot of two hundred are not the same coverage, so record the lot size and the sampling plan. Fuse to the actual production shell fabric for the style under the agreed conditions, record the actual fusing parameters, and record the following:
| Check | How to test it | Accept / investigate |
|---|---|---|
| Bond strength as received | Peel test on a 5 cm strip fused to the production shell fabric | Meets the value agreed in the Fusing Test Request; record the figure, not just “pass” |
| Bond retention after washing | Repeat after 5 washes (using the exact ISO 6330:2021 procedure agreed for the style), and after 10 or 20 for high-value styles | Compare the measured post-wash separation force with the buyer-agreed minimum and the as-fused baseline. Investigate any fall beyond the agreed limit, even if the figure still looks adequate |
| Strike-through | Inspect the shell-fabric face after fusing and again after steam pressing | Any shiny glue dots visible on the face are an appearance rejection for the affected fabric, not a cosmetic note |
| Colour change | Compare the fused sample with an unfused control after washing | Any visible colour change in the shell fabric fails that combination, judged against the agreed visual rating or colour-difference standard |
| Hand-feel change | Handle the fused sample against an unfused control | Hardening that makes the component feel board-like fails the combination, judged against the agreed hand-feel rating or the corresponding physical measurement |
| Bubbling and surface unevenness | Visual inspection after washing and after pressing | Any bubbling after the agreed wash cycle is a failure where the buyer has set a zero-tolerance appearance standard for it |
| Moiré / wavy effect | Visual inspection on light, open-texture fabrics after fusing | Typical of woven interlining or linear dot patterns; change the dot pattern or the base |
| Roll and lot identity | Check the roll label against the order: construction, weight, adhesive type, lot number | A wrong adhesive type is the most expensive mistake here, because it is discovered last |
Keep the results with the style file, next to the supplier’s original test report. When a problem appears in bulk production, comparing the two documents — what the supplier tested versus what was delivered — turns an argument into a decision.
Complaint Attribution: Whose Fault Is It?
When a customer complains about a fused component, the first question is not “who pays?” but “what caused it?” The table below is a diagnostic starting point, assembled from the failure modes in the sources read for this article; it is guidance for investigation, not a ruling on any individual claim.
| Fault | Most likely causes | First investigation point (not a determination of liability) |
|---|---|---|
| Bubbling / blistering after washing | Under-fusing (temperature, pressure or time too low); adhesive / shell-fabric mismatch; moisture trapped during fusing | Factory fusing process; then interlining selection |
| Strike-through (glue visible on the face) | Adhesive melting point too low for the shell fabric; fusing temperature too high; a PA adhesive formulation susceptible to steam-related strike-back under the actual pressing conditions; scatter coating on lightweight fabric | Interlining selection (adhesive type); then factory fusing conditions |
| Hardening of hand feel | Scatter-coated adhesive; interlining too heavy for the shell fabric; over-fusing | Interlining selection; then factory fusing conditions |
| Wavy / moiré effect | Possible causes include incompatible woven-interlining construction, adhesive dot geometry, differential dimensional change between interlining and shell fabric | Interlining selection (base and dot pattern) |
| Delamination (layers splitting) | Separation within the interlining structure or at the adhesive-to-shell interface; possible causes include inadequate fusing, adhesive failure, washing beyond the adhesive’s rated temperature | Interlining supplier (product quality); then care-label accuracy |
| Colour change after washing | Visible interlining colour through a sheer shell fabric is a colour-matching problem; actual colour change after washing needs separate diagnosis, including dye migration in washing | Interlining selection (colour matching); then shell-fabric dyeing |
| Shrinkage mismatch / puckering | Interlining and shell fabric shrinking at different rates; untested combination | Selection and testing (never wash-tested) |
Two disciplines follow. First, a fault that appears only after washing is a testing failure as much as a production failure. Second, responsibility is assigned by evidence, not by position in the supply chain — the incoming-inspection record, the supplier’s test report and the factory’s fusing log are the three documents that decide it. Add the fusing cause to your existing defect identification record; the pattern across styles is usually more informative than any single complaint.
Practical Do’s and Don’ts
The source guide’s fusing-room checklist is short and worth following exactly, because most fusing faults are process faults:
| Do | Don’t |
|---|---|
| Cut interlining in the same direction as the shell fabric | Cut the interlining to the full pattern size when the construction requires it to be cut smaller |
| Cut the interlining approximately 5 mm inside the shell-fabric pattern edge where the specified construction requires it | Cut the interlining beyond the pattern edge |
| Place the adhesive-coated side of the interlining against the wrong side of the shell fabric, and load the assembly according to the press manufacturer’s instructions | Put shell on top of shell |
| Check that there are no folds in the shell or the fusing | Allow folds at the output end while the piece is still hot |
| Check the glue-line temperature with a temperature strip | Run hotter or colder than the specified temperature |
| Check the machine speed before use | Run faster than the set speed — it gives a poor fuse |
| Check the roller impression with carbon paper | Allow dirt on the roller or thread |
| Check the bonding before starting production | Start feeding without a temperature check |
Two additions from the buyer’s side: record the fusing conditions for each style (temperature, pressure, time, press model) in the tech pack, so a second factory can reproduce them; and re-check bonding after any change of shell-fabric lot, because a new dyeing or finishing batch can change how the adhesive behaves. A fused collar is also a stitched component, and the seam type chosen for collar and cuff affects how much stress the fused bond must carry.
Common Misconceptions
“Thicker interlining is always better.” It is not. Weight and stiffness have to match the shell fabric and the component. A heavy interlining on a light blouse feels board-like and risks strike-through; a light interlining on a jacket forepart will not hold the lapel’s shape. Nonwovens span 10 gsm to over 200 gsm precisely because the range of jobs is that wide — select by the component’s requirement, then confirm by testing.
“Higher bond strength is always better.” It is not. Bond strength has to be enough for the component and the care regime, and no more. Excessive bond strength usually means excessive adhesive, which hardens the hand feel and risks strike-through on lightweight fabrics. The right question is what bond value survives the garment’s wash cycle without changing the hand feel.
“If the supplier’s laboratory passed it, the production will pass.” A laboratory test proves only that a combination can work under the conditions tested — not that the delivered lot matches the tested sample, or that the factory’s press reproduces laboratory conditions. That is why incoming inspection and a retained test report matter: they are the only evidence connecting the laboratory result to the goods cut.
“Interlining is a minor trim, so it can be substituted freely.” It cannot. Substituting a different base fabric, weight or adhesive changes the fused laminate’s behaviour — its stiffness, its wash resistance, its reaction to steam pressing. Any substitution should go through the same fusing test as the original selection, and the buyer should be told. A silent substitution is how a style that passed its first wash test starts bubbling in the second production run.
Sources
- Online Clothing Study, “Different Types of Interlining and Interlining Selection Procedure” (published 2018-09-25), https://onlineclothingstudy.com/different-types-of-interlining-and/ — main source for the definitions, base-fabric types, adhesive table, Fusing Test Request format, do’s and don’ts, and author note. Read in full on 2026-11-10. (The article page’s update date of 2026-08-13 could not be independently verified and is not cited.)
- National Institute of Standards and Technology (NIST), “Apparel Manufacturing Glossary for Application Protocol Development” (NISTIR 5572, February 1995), https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir5572.pdf — defines interlining as materials fused or sewn to specific areas inside garments or garment components, providing shape, support, stabilisation, reinforcement, hand and improved performance. Full text read 2026-11-10.
- Zhang, Y. & Kan, C. (2018), “A Review of Fusible Interlinings Usage in Garment Manufacture”, Polymers 10(11), 1230, DOI: 10.3390/polym10111230 — peer-reviewed review of fusible interlining history, classification, manufacture, properties, fusing technology and applications; used as an independent source alongside the practice guide above.
- US Patent 8,603,926, “Textile fabric with improved finish, production and use thereof” (Carl Freudenberg KG, granted 2013-12-10), https://patents.justia.com/patent/8603926 — shirt interlining must withstand washing up to 95°C; HDPE (melt range from about 130°C) is typically the adhesive used (background discussion). Summary read 2026-11-10.
- US Patent 10,407,809, “Thermally fusible sheetlike structure and method for production thereof”, https://patents.justia.com/patent/10407809 — polyolefin-based adhesive structure; cited only for the claim that adhesive chemistries besides HDPE and PA are used. Summary read 2026-11-10.
- US Patent Application 2021/0198842, “Thermally fusible sheet body”, https://patents.justia.com/patent/20210198842 — interlining should withstand washing up to 95°C and demanding drying. Summary read 2026-11-10.
- US Patent 5,439,737, “Two-phase fusible interlining made of a semi-interpenetrating network of thermoplastic resins”, https://patents.justia.com/patent/5439737 — a specific polyamide-containing, two-phase adhesive system developed to reduce or eliminate steam breakthrough; the disclosed thermoplastic polymers (polyamides and polyesters, alone or mixed) have a melting-point range of 80–130°C. Full text read via Google Patents 2026-11-10.
- US Patent 6,986,935 (assignee Carl Freudenberg KG), “Fusible interlining”, https://patentimages.storage.googleapis.com/c1/ac/12/dec9a69b305b07/US6986935.pdf — background discussion cites earlier interlining systems with separation-force values below 10 N/5 cm, falling further after washing. Summary read 2026-11-10.
- ISO 6330:2021, “Textiles — Domestic washing and drying procedures for textile testing”, https://www.iso.org/standard/75934.html?browse=tc — fourth edition (2021-11), cancels and replaces ISO 6330:2012; 16 Type A, 12 Type B and 7 Type C washing procedures; six drying procedures. Scope read 2026-11-10. (ISO 6330:2012 is superseded; BS EN ISO 6330:2021, https://knowledge.bsigroup.com/products/textiles-domestic-washing-and-drying-procedures-for-textile-testing-3 — summary read 2026-11-10.)
- IS 12806:1989, “Non-woven fusible interlinings — Specification” (Bureau of Indian Standards), https://law.resource.org/pub/in/bis/S12/is.12806.1989.pdf — requirements for nine varieties; warns against delamination. Listing read 2026-11-10. (The edition consulted for this article; the listing alone does not confirm its current BIS status.)
