Bias (textile)

For woven textiles, grain refers to the orientation of the weft and warp threads. The three named grains are straight grain, cross grain, and the bias grain. In sewing, a pattern piece can be cut from fabric in any orientation, and the chosen grain or orientation will affect the way the fabric hangs and stretches and thus the fit of a garment.

Generally speaking a piece is said to be cut on a particular grain when the longest part of the pattern or the main seams of the finished piece are aligned with that grain.
Non-woven materials such as felt, interfacing or leather do not have a grain in the textile sense.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.0

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