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What is "Seam Allowance" - Definition & Explanation

The amount of fabric extending beyond a seam and not visible once the seam is sewn.
Narrow width between the seam line and the raw edge of the fabric. Seam allowances vary depending on where they occur on the garment and the manufacturers' specifications. Home sewing patterns generally have a 5/8" seam allowance except at hems. Commercial patterns generally use 1/4" to1/2" except at hems.
The width of fabric between the sewn seam and the cut edge. Traditionally 1/4 inch.

Some other terms

Some more terms:

A chemical reaction that changes cellulose linters (cotton) into cellulose acetate. This reaction improves the heat and rot resistance of the fiber yet does not adversely affect the other good...
A yarn composed of one or more filaments (q.v.) that run the whole length of the yarn. NOTE: Yarns of one filament and yarns of several filaments are referred to as mono-filament and...
Spandex or elastane is a synthetic fiber known for its exceptional elasticity (stretchability). It is stronger and more durable than rubber, its major plant competitor. It was invented in 1959 by...
A popular staple lightweight sport coating tweed with a rough napped surface. Named for the Cheviot sheep from the Cheviot Hills of Scotland. Fabric is rugged, rather than harsh in hand, with...
Literally a color description given to yellow-brown, earth/dust tones or greenish tinged shades, the term khaki has also evolved to define a strong cloth made of cotton, worsted or linen yarns and...

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