Interlining
A middle layer of fabric inserted between the outer shell and the lining of a garment to provide warmth, structure, or padding.
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What is Interlining?
Interlining is a fabric layer placed between the outer shell fabric and the lining of a garment. While interfacing is bonded to specific garment pieces to add structure, and lining covers the garment interior, interlining is a full, separate layer sandwiched between the two — primarily for thermal insulation, padding, or additional structural support.
The term is sometimes used interchangeably with interfacing in casual conversation, but they are technically distinct in the garment construction industry. Interlining is a full-width, free-floating or lightly attached middle layer; interfacing is typically fused or sewn to a specific part of one panel.
Primary functions of interlining:
Thermal insulation:
- Down interlining: Provides maximum warmth at minimal weight; used in premium outerwear
- Polyester wadding/batting: Mass-market insulation option; used in quilted jackets, bombers, anoraks
- Wool/fleece interlining: Provides warmth with natural fiber properties; used in formal overcoats
- Thinsulate (3M): Technical synthetic interlining for performance outerwear
Structural padding:
- Shoulder pads (foam or fiber-fill): A form of interlining added to jacket shoulders
- Chest canvas: A woven horsehair and linen interlining in the front chest piece of tailored jackets, providing structure and drape without stiffness
- Quilted interlining: Provides both thermal properties and decorative surface texture
Body-shaping and smoothing:
- Boning channels (corsetry): A form of structural interlining providing shape and support
- Foam cup interlining: Used in bra construction and structured bodices
- Shoulder shaping interlining: Available as pre-shaped pads
Protective interlining:
- Flame-retardant interlining: Used in workwear and PPE garments
- Anti-bacterial interlining: Used in medical and performance sportswear
Why This Matters for Fashion Entrepreneurs
Interlining is most relevant for fashion entrepreneurs working in outerwear, occasion wear, tailoring, and performance categories. It is a hidden but significant determinant of warmth, comfort, and perceived quality.
When interlining matters most for Indian brands:
- Winter outerwear for North India: Delhi, Punjab, and Himalayan region consumers experience genuine cold. Quilted jackets, puffer vests, and woolen coats with appropriate interlining are a real market need. Choose interlining weight based on the target warmth rating (grams per square meter of fill power).
- Bridal and occasion wear: Structured bodices in lehengas and gowns often use foam, boning, or layered interlining to achieve the required silhouette without relying entirely on the outer fabric.
- Premium suiting: The chest canvas in a well-tailored jacket (whether horse-hair canvas for bespoke or fused canvas for RTW) is a form of interlining. This single component is what separates a suit that drapes naturally from one that looks stiff.
- Corporate uniforms: Blazers and formal jackets for corporate clients may require specific interlining specs for year-round wear comfort.
Spec clarity in tech packs: Include interlining type, weight (grams per square meter), fill power if down, construction method (stitched channels, baffle box, sewn-through), and placement diagram in your tech pack. Factories left to choose their own interlining will default to the cheapest option.
Sourcing Guide
Interlining sourcing in India:
Polyester wadding/batting (most accessible):
- Widely available at fabric wholesale markets in Surat, Mumbai (Bhiwandi), Delhi (Gandhi Nagar), and Bangalore
- Sold by the roll; standard widths 60 inches; weights from 100 GSM to 400 GSM
- Cost: ₹40–₹120/meter ($0.48–$1.45) depending on weight and quality
Down and feather interlining:
- Sourced through specialized suppliers in Delhi and Mumbai
- China is the dominant global source; Indian importers include down bedding manufacturers who also supply to garment factories
- Specify fill power (600–800 for quality outerwear) and down-to-feather ratio (90/10 premium)
Chest canvas (tailoring):
- Available from specialist tailoring suppliers in Mumbai (Opera House district), Delhi (Karol Bagh), and Bangalore
- Freudenberg and Wendler supply woven chest canvas through India distributors
- Traditional horse-hair canvas: ₹300–₹800/meter ($3.60–$9.60)
Foam and shoulder pads:
- Widely available at garment accessory markets; Sadar Bazaar (Delhi), Dharavi (Mumbai)
- Molded shoulder pads: ₹8–₹40 ($0.10–$0.48) per pair depending on shape and size
- Bra cups and foam inserts: Available through lingerie supply distributors in Bangalore and Delhi
Pricing & Costs
Interlining pricing in India:
- Polyester wadding, 100 GSM: ₹35–₹65/meter ($0.42–$0.78)
- Polyester wadding, 200 GSM (medium warmth): ₹60–₹100/meter ($0.72–$1.20)
- Polyester wadding, 300–400 GSM (heavy): ₹90–₹150/meter ($1.08–$1.80)
- Fleece interlining (anti-pill): ₹100–₹200/meter ($1.20–$2.40)
- Thinsulate (imported technical): ₹350–₹800/meter ($4.20–$9.60)
- Down fill (per kilogram, 90/10): ₹2,500–₹5,000/kg ($30–$60); a quilted jacket uses approximately 100–200 grams
- Chest canvas (woven, for tailoring): ₹300–₹800/meter ($3.60–$9.60)
- Foam shoulder pads: ₹8–₹40/pair ($0.10–$0.48)
- Pre-formed bra cups (foam): ₹20–₹80/pair ($0.24–$0.96)
Cost per garment example — quilted jacket:
- Polyester wadding (200 GSM, 1.5 m): ₹120 ($1.45)
- Lining fabric (polyester, 1.8 m): ₹108 ($1.30)
- Outer shell (nylon ripstop, 1.8 m): ₹360 ($4.32)
- Interlining represents approximately 15–20% of total fabric cost for this category
Frequently Asked Questions
Interfacing is applied to specific garment pieces (collar, cuff, placket) by fusing or sewing to add stiffness and support to those areas. Interlining is a full middle layer inserted between the outer shell and lining, primarily for warmth, padding, or overall structural support. A garment may have both: interfacing on the collar and interlining throughout the body.
For North India winter conditions (Delhi, Punjab, Haryana temperatures of 5–15°C), 150–250 GSM polyester wadding provides adequate warmth. For Himalayan foothills or higher altitudes, 300–400 GSM or technical insulation (Thinsulate, down) is appropriate. Always specify the warmth range of the garment in your product brief and choose interlining accordingly.
Generally no — interlining is inserted during garment construction as it is sewn between layers. Retrofit interlining to a finished garment is structurally impractical in most cases. The only common exception is removable interlinings (zip-out linings with fill) used in convertible outerwear, which are designed as a separate insertable component from the outset.
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