I don't know, yet.
Right now, I work at Party City to help with this Halloween madness, so I'm kind of turned off to costumes.
But we'll see. I've got a cloak somewhere and a paper parasol. And there might be some make-up left in the Halloween box if it wasn't destroyed when the basement flooded. Plus all the bits of past costumes left in there. I may be able to come up with something on the fly.