What should i do on thi bet?

I made a bet with some girls on the volleyball team regarding beating them in volleyball. Needless to say, I didnt. Now, I have to go to their practices every day for a week dressed as a female volleyball player. If I dont dress girly enough, then I owe them $800. They will be checking and inspecting me everyday (including undergarments) to make sure I look the part. They will be putting makeup on before each practice. What should I wear?