The "Magneat" is a simple little wire management system that uses a magnet to clip to your shirt. By winding your headphones' excess cable around its post, you'll be less likely to catch them on things. Or that's the pitch, anyway.
You can only buy them in Iceland at the moment, though, so you'll have some time to consider how much you want them before you make the flight over. Oh wait — you can buy them online and have them shipped over.
Honestly, the wire shortening I get, but I'm not quite sure why you'd want to attach it to your clothing.
Magneat product page [Magneat.com]