A sewing cut that runs diagonally to the weave of the fabric, rather than perpendicular.
The bias or cross-grain direction of a piece of woven fabric is at 45 degrees to its warp and weft threads. Woven fabric is more elastic as well as more fluid in the bias direction. The "bias-cut" is a technique used by designers for cutting clothing to utilize the greater stretch in the bias or diagonal direction of the fabric, thereby causing it to accentuate body line and curves by draping softly. For example, a full-skirted wedding dress cut on the bias will hang more gracefully.