Need some prom dress help!!!?

One of my friends lost a bet to me over some ping pong after he was being sexist and saying a girl could never beat a boy. If I would have lost I would have had to be his maid for a day, but because he lost he now has to dress up like a girl going to prom haha! I get to go all out on him except for shaving his legs. I would like some suggestions on what dress to get him to wear and any other prom things yall think I should do to him! I live in Austin so I was thinking we could get him a used dress on craigslist or even on sale online. Links to dresses would be helpful, and the girlier the better.