Definitely need to know what era.. and stay away from icky leg avenue costumes!! PLEASE just go to a local military surplus store, tell the gentleman at the counter WHAT plane you are posing with, and kindly ask him to point you to the appropriate apparel.
MY FAVORITE concept is a bomber jacket, obviously a man's.. and maybe a hat, or something, and then lingere underneath.. How hot is that? You have a VERY feminine look, so you won't look like a dude.. seriously..
Here look at her: CORSET AND SHORTS MILITARY PINUP
But your best bet is to ask an expert about the era.. and sexy it up a bit!!
I would just make my own outfit out of military surplus stuff.. haha..
good luck!.. let me know if you need any help, I make custom costumes!!