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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 good quality wool. If it is made in cotton, it is usually called suede cloth. Duvetyn has a close satin weave that is brushed, singed, and sheared to conceal the weave. It has a smooth plush...
A plain-woven cotton fabric; characterized by fine rib lines in the warp direction created by alternate coarse and fine ends, or by having two (or more) ends weaving as one alternately with a single...
The density of a material divided by the density of water. Expressed as a number greater than 0. Materials with specific gravity less than 1.00 will float and materials with specific gravity greater...
A component in cotton of trash (q.v.) in the form of a heterogeneous assortment of vegetable fragments, most of them being small pieces of leaf, leaf bract (a small form of leaf growing beneath the...
A natural textile made from the pulp of bamboo grass, it is considered sustainable, because the bamboo plant grows quickly and does not require the use of herbicides and pesticides to thrive....

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