Grain is the direction of the yarn in a fabric. In all woven fabrics, there are two set of yarns which interlace at right angles. The yarn which runs in the lengthwise direction is called warp, and the one which runs in crosswise direction is known as the weft. The warp yarns are known as length-wise grain and weft yarns are called as crosswise grain. Length wise yarn is more strong and stiff. It is made with of higher twist yarn unlike the crosswise yarns.
Grain plays a very important role in garment designing and drape. The bod-ice blocks, skirt patterns are cut along the lengthwise grain (i.e., parallel to the sel-vedge) . This ensures good drape and fall of the garment on the wearer. Therefore all main parts of the garments are cut in lengthwise grain. Crosswise grain gives more elasticity. Small parts of the gar-ments like collars, pockets, and yokes can be cut on cross grain.