Have her do this http://www.getdare.com/bbs/showthread.php?t=88463
but you get to control when she changes. If you want to, have her do it 2 days in a row. It will make it very hard for her to control her bladder. She might possible even have an accident in her normal clothes when she's done with it. That would humiliate her.

Hello there! My GF has been a bitch and a slut and a whore. You are good at coming up with punishments so punish this faggot. She sold her virginity for 50 dollars on the street. I am on her account though.