Back in college, some friends and I used to put the fuzzy drawstring ends of our sweaters into our ears and pretend we could listen to music through them during improv and film class exercises. I was surprised when a friend introduced me to Hoodie Buddie, a hooded sweatshirt that contains a standard headphone jack in the front pocket that plugs into any headphone-compatible device.
Along with the headphone jack, there are embedded cables within Hoodie Buddie that connect to the headphones, all built into the ends of the drawstrings.
Once you get a Hoodie Buddie, you reach into the front pocket and hook the headphone jack up to your MP3 player, smartphone or any listening device with a headphone jack. You then insert the ends of the drawstrings into your ears, and presto, you're listening to music on your sweater.
Another cool aspect is that you can throw your hoodie into a washing machine, headphones and all. Just set your machine on a cold water cycle, and hang your hoodie to dry once you're done.