Blocking is especially useful for garments that need exact measurements or crisp stitch definition. Lace shawls, yoke jumpers, cardigans, summer tops and blankets made from blocks all benefit from blocking accessories for knitting and crochet, because controlled stretching opens up the stitches and corrects small variations in tension. It also helps seams to sit more neatly and stops the edges from curling inwards.
For socks, mittens and hats, sock blockers, T-pins and blocking wires add volume where needed without distorting the fabric. In modular projects, such as granny squares or knitted patchwork pieces, a granny square blocking board evens out all the squares before joining them, preventing size differences that will show in the finished piece.
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