Normally I don't enjoy posting pervy stuff, but this is fresh from the wow forums:
Type in game this command:
/script SendChatMessage("\124cff9d9d9d\124Hitem:128:0:0:0:0:0:0:0\124h[Deprecated Tauren Trapper's Pants]\124h\124r");
You will link in /say [Deprecated Tauren Trapper's Pants] -- Now, ctrl-rightclick them, and you can see your character without underwear. You can also link them in Trade to freak people out!
For example, Draenei female: http://i10.tinypic.com/4u3b7kl.jpg *Vladinator's pic
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Enjoy! lol