is the direction of the threads of a fabric. Fabrics have two grains:
warp (lengthwise grain, parallel to the selvedge) and
weft (crosswise grain, at right angles to the selvedge). Crosswise grains stretch a bit more.

is the direction of the threads of a fabric. Fabrics have two grains:
warp (lengthwise grain, parallel to the selvedge) and
weft (crosswise grain, at right angles to the selvedge). Crosswise grains stretch a bit more.