Whenever I need a cord for a necklace or a drawstring, I go out to the store to buy it or use (what amounts to) a single crochet chain. They are both simple to use and quick to make up. I don't like to use chains for jewelry because they eat my hair. I haven't figured out what it is, but I end up having to rip out my hair to get the chain loose. It's not fun.Kumihimo is a Japanese braiding technique that can create round or flat cords. Supposedly, Samurai used these cords to tie their armor together.