Knits do not have lengthwise and crosswise yarns like woven fabrics. Instead the interlocking loops of yarns create lengthwise ribs called wales , and crosswise lines called courses . If it does not run parallel with the edge, it is off grain and will require blocking. If the fabric has a permanent-press finish, it cannot be straightened. Preparing the Fabric For best results, wash and dry the fabric as you will the finished garment.
Washing helps to relax the fabric and removes excess fabric sizing.
Excess sizing can cause skipped machine stitches. Preshrink any trims, interfacings, linings, and notions which will be used in the garment. Do not preshrink knit ribbing. It tends to distort during prewashing and shrinkage occurs in the lengthwise direction making the rib trim narrower, but not tighter. Blocking Knits Mark the grainline by marking along a course near each cut end of the fabric.