This is the D20 Button-Down Shirt available from ThinkGeek ($50). It's covered in D-20 dice that have all rolled 20's. How about that! Personally, I would have preferred to see a variety of different rolls, but that's just me and I'd still have no intention of buying this shirt even if it did, so my opinion doesn't matter for shit. I take that back, I actually do kinda want this shirt. Then whenever I'm tabletop gaming with the friends I'm going to make soon I can joke that maybe they'd like to roll me instead of the actual dice. Wouldn't that be a hoot?! Wait, guys -- not down the stairs, NOT DOWN THE STAIRS!
Thanks to Cyndi, for reminding me I need to buy a dress-shirt so I can eat at fancy restaurants.