Steve Jackson Games
There are many Munchkin shirts - each with a different special power.
Official Tournament Rules
If you are wearing an official Munchkin shirt (on your torso, right side out), you may draw one extra card from either deck when you start play or when you come back from the dead.
If you are wearing an official Munchkin shirt it may give you special powers besides the ones listed here - see the official site for specifics.
