DIY hair tie// 1: Pick up at least a few yards of stretchy elastic (3/4" - 1" thick) from your local craft store. 2. Cut strands that are 10" long—this length works for my hair thickness but you may have to test out one and cut more or less. 3. Fold the strand in half. 4. Make a loop, pull the ends through and tie a knot leaving 1" of a tail at the end.