Crosswise grain

In woven fabrics the crosswise grain of refers to the threads that run perpendicular to the length of the fabric as it comes off the bolt (cardboard roll) or perpendicular to the selvedges. When you take a roll of fabric to a store assistant they will cut your length along the crosswise grain. In most garments the cross grain runs across the body, parallel to the floor. The cross grain is made up of weft yarns which are woven over and under the lengthwise yarns at a 90 degree angle.

selvedge, weft, warp bias
Diagram to show the cross grain of a woven fabric.

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