Looking for a Munchkin Card

[Berserk Monk]

So, I'm looking for a particular card in the Munchkin card game. It's a go up a level card that says something like "Dressed as your Character." I don't own any of the sets, and I'm wondering which expansion it's in. I was thinking it be funny for me to come to one of my campaign sessions dressed in my suit of armor and give that card to the DM and see what happens (at the very least, it would make for a good joke).

[Arokh]

I think you might mean "Costume As Your Character" from Munchkin 4 - Need for Steed TM

So long, Arokh.