There are at least two that I know of. EvilInnocence's Crossdresser (Windows only):

http://www.evilinnocence.com/xd/

And PhilC's Wardrobe Wizard (Windows and Mac):

http://www.philc.net/WardrobeWizard.htm

I haven't tried either myself, on account of being a broke Mac user, but I've heard good things about both.