It's probably not news to you that DM is featured in the upcoming Left 4 Dead 2 game, but, you can unlock some items from the game for your avatar... including the shirt!
Bonus that I already liked the previous game, but now I'm definitely getting this one.
http://www.gamedaily.com/games/left-4-dead-2/xbox-360/game-features/left-4-dead-2-getting-avatar-rewards/
