LOL, that sounds awesome. That'd be a hilarious halloween costume. Sounds like your going for the sporty look, right?
Id say wearing makeup is a must! Your clothes need to be tight fitted. Idk if you have big breasts but if not get a bra and stuff it. Yes yes the blonde wig sounds good, And perhaps the tank tied back to show some midriff if your comfortable, dont have to. If you wear shorts, wear the tight, short, spandex kind.
Because its halloween, you should really exagerate it. Well good luck, and best of all, have fun