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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:

Classic all-cotton “Army twill” fabric made of combed two-ply yarns. Usually vat dyed, mercerized, and Sanforized. Used traditionally for army uniforms, chino is now finding popularity in fashion...
Plain, medium weight, cotton weave of a medium weight that is firm, smooth, with no gloss. Warps and washes very well. It is made from both carded and combed yarns. Percale sheeting is the finest...
Pima Cotton is along staple cotton, creating by combining Egyptian cotton and cotton grown from the Pima Indians in the southwestern United States. It is weel know to be the finest cotton because of...
A woven fabric construction made by interlacing two or more sets of warp yarns with two or more sets of filling yarns. A weft knit fabric in which two layers of loops are formed that cannot be...
The act of punching holes in JACQUARD CARDS according to a pattern or DESIGN DRAFT, so that when they are set up in the LOOM, they will control the weaving mechanism and the pattern will be woven...

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