(I can't post in the XBL News Section so i post it here ;))
Just go online on Xbox Live, paste one of the links, download, done!
A new T-Shirt for your male or female Avatar!
Male Avatar T-Shirt:
Female Avatar T-Shirt:Code:http://marketplace.xbox.com/games/offers/b8a42800-0000-4000-8000-00005858081c