Something like player1's second pic would probably be the best. It's not a Miss contest after all. I do hope nobody will have time to care about tits and tighs during a game and anyway there's more to women than stuff like that.
So it may seem easy, just covering most of the model in uniform. But it's not.

A woman has another body configuration and specific walk and you should be able to tell a woman from a man just by the way they walk or run.
Speaking of which, is this customization restricted to just the model, or will it affect the movement too? Because if you can't adjust the movement too, like I mentioned above, then you'll have a woman model moving like a man's body, and it won't matter how she looks 'cause it will look strange anyway.