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purpose[ edit ] elastics may be either braided, knitted, woven, or transparent. braided elastic, the most common form of elastic, becomes more narrow as it stretches. stitching or piercing this kind of elastic causes it to quickly lose its ability to return to its original shape (a ball-point sewing needle
will minimize this damage). it has distinct parallel ribs along its surface, and is used for hems, swimwear, and leg bands. knitted elastic is considered soft, lightweight, and quite strong. it does not narrow when stretched, and piercing it with a needle does not affect its ability to return to its...
https://en.wikipedia.org/wiki/Elastic_(notion)