Interlining

Interlining is a layer of fabric placed between the outer garment fabric and the lining, or between layers in a curtain, intended to provide structure, warmth, and opacity. In apparel, the interlining adds body and shape, improves drape, and can help the garment recover after folding. It also can reduce creasing and prolong wear.

Two broad forms exist: fusible and non-fusible. Fusible interlinings have an adhesive that bonds to the fashion fabric when heated, allowing faster construction. Non-fusible interlinings are sewn or attached by means of glue, and require careful tailoring. Interlinings can be woven, nonwoven, or knit, and may be made from wool, cotton, rayon, polyester, or blends. Common tailoring staples include horsehair canvas and wool-cotton canvas for jackets and suits, and lightweight fusible interlinings for shirt collars and cuffs.

In curtains and draperies, interlining adds insulation, weight, and dimensional stability, improving fullness and reducing glare through the fabric. These are typically made from cotton, wool blends, or synthetic fibers and are installed between the main fabric and the lining.

Construction considerations include choosing the fabric weight to match the outer fabric, ensuring compatibility with the garment’s wash care, and deciding between fusible and non-fusible options based on finish and hand desired. Interlining is generally not washed with the garment and is usually cleaned only with the outer fabric or dry cleaned.