I asked my daughter about this, and she came up with something I didn't think of...hair clips.
She says these are fantastic for bundling the cords from earphones, and also for keeping it clipped to a specific part of your jacket, while wearing them.
She says you can get them about 8-10 in a pack at a $1 store.
She also wanted me to tell everyone not to throw away those sock hanger hooks, especially the ones with the double hooks on them. She says to hold them with the hooks pointing up, slip it over your belt, and the rest will come to you like a bright light in a dark tunnel. And when you figure it out, you'll never want to throw them away again. (she considers them essentials for camping)