You put on a uniform. Begin by putting on panties and a bra. Pad the bra, and not just a little - I want your fake boobs to be bulging out of their undersized restraints.
Once you've done that, put on any top you like, but don't put anything else on the lower half of your body. Except heels - put on some high heels, the highest you have. Sport isn't supposed to be easy, after all.