By James Hibberd
Updated October 24, 2011 at 06:21 PM EDT

Mad Fashion‘s Chris March is making Andy Cohen a costume for a special edition of Watch What Happens Live — see if you can guess what it is.

Cohen’s show is having its first-ever Halloween party at 11 p.m. ET on Oct. 31. March’s show, Mad Fashion, airs Tuesdays at 10 p.m., with tomorrow’s episode featuring outfits for Vanessa & Angela Simmons. He’ll join Top Chef Just Desserts judge Gail Simmons and The Real Housewives of Atlanta’s Pheadra Parks at Cohen’s party. Here’s the cryptic photo from Bravo …