Talk about Spreadshirt (2009-11-24, 20:24:41):
Here and now - one for the fastest kid in town http://382325.spreadshirt.net/hic-et-nunc-A10548372
Since I posted about how to make your t-shirt into a swimsuit, I thought I would let you all know about these instructions for turning your favorite t-shirt in to a pair of boy-cut underwear. From the Craft Blog here is a link to the tutorial on Flickr.
You can check out the designers website here: Lorigami.com
Classic, casually cut T-shirt, 100% combed cotton Softhanded screen print
American Apparel classic T-Shirt, 100% cotton Softhanded screen print
American Apparel classic T-Shirt, 100% cotton 
Lindsay Patross
Dave
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Very helpful post. I’ve been wearing t-shirt underwear for some time but never took the time to modify the shirts in any way. Thanks!