I'm a short, busty & love my biker too! I haven't really had any trouble with my chest plate. Most of the problems I hear about is with the fitting of the vest. I joined before that was a requirement & I've never gotten one.
If you have some other questions about costuming as a female in Star Wars costumes, please join our ladies ONLY FB group. There you can ask all those "embarrassing" questions and get answers from other women.
https://www.facebook.com/groups/341692229360888/