Glossary
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Bias

The diagonal, 45-degree direction across a woven fabric, where it has the most natural stretch and drape.
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Ease

The extra room built into a garment beyond the body's actual measurements, needed for movement and a chosen fit.
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Grainline

The direction of the lengthwise threads in woven fabric, used to align pattern pieces for correct drape.
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Muslin / Toile

A test version of a garment sewn in cheap fabric to check fit and construction before cutting into the real fashion fabric.
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Notch

A small triangular or straight cut into the seam allowance, used to mark matching points between pattern pieces.
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Right Side / Wrong Side

The 'right side' is the face of the fabric meant to show on the finished garment; the 'wrong side' is the reverse, usually hidden inside.
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Seam Allowance

The extra fabric between the cut edge and the intended stitching line, needed to actually sew a seam without the fabric falling apart.
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Selvage

The self-finished, non-fraying edge running along both lengthwise sides of woven fabric.
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Underlining

A support fabric cut to the same pattern pieces as the fashion fabric and basted to its wrong side, treated afterward as a single combined layer.