GottimIt's called DesignDoll and you can download it here.
It also made me download some shit from the microsoft website to make it work, so if you don't have it already, it will show you what you need.
Haven't used it as a ref yet but it seems pretty neat.
You can alter the head, chest, abdomen, arms, and legs separately; so you hardcore gender users can have whatever you want.
But yeah, go knock urself out. I've only had it for an hour or so and it's a lot of fun.