Seam allowance (sometimes calledinlays) is the area between thefabric edge and thestitching line on two (or more) pieces of material beingsewn together. Seam allowances can range from1⁄4 inch (6.4 mm) wide to as much as several inches.[1] Commercial patterns for home sewers have seam allowances ranging from1⁄4 to5⁄8 inch (6.4 to 15.9 mm).[2]
A 5/8 inch (1.5 cm) seam allowance provides enough extra between the seam line and the cut edge of the fabric to make sure that the fabric will be safely caught as they are being joining together. This is particularly important when working with fabrics that ravel easily.[3]
Sewing industry seam allowances range from1⁄4 inch (6.4 mm) for curved areas (e.g. neck line,armscye) or hidden seams (e.g.facing seams), to 1 inch (25 mm) or more for areas that require extra fabric for final fitting to the wearer (e.g. center back). Curved seams generally have a smaller seam allowance than straight seams; bulky seams with a large amount of seam allowance are more difficult to press into or conform to a curved shape.[1]
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