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This is the grain that runs at a 45 degree angle to the straight grains, or the warp (lengthwise) and weft (crosswise) grains. Cutting along the bias results in a fabric that is slightly stretchier than the warp or weft, and is often used for binding a quilt.
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Also known as the crosswise grain, this is the thread that runs perpendicular to the selvedge of the fabric. The weft and the warp are straight grains (as opposed to the bias) so cutting along these grains will result in fabric pieces that don’t stretch.