No problem! I like combating some of the misconceptions out there about corsets. Good luck with your purchase!
About that... yes, you called me out on that (and rightfully so), so I feel I should clarify that the health risks of corsets are generally associated with those people who wear them incorrectly. Unfortunately, this happens to be a large percentage of corset wearers because they don't take the time to thoroughly research exactly how to wear one.
This has been most prominent in the Renaissance Festival world by people who think "Hey, I can get the girls up on display!" and then walk around all day in 90+ degree heat wearing thirty to fifty pounds of garb with their breathing naturally constricted and drink alcohol all day without properly hydrating and then wonder why they are passing out and overheating.
I’ve cosplayed Black Cat, recently in fact http://www.therpf.com/showthread.php?t=239476 and I do use a corset, but I use a latex one under the bodysuit, I have nothing like a super heroic figure and need one for the curves, but I didn’t want to wear one over the costume because its IMHO, inaccurate, I’ve never seen a pic of Black Cat in the comics wearing one. I was in the costume for over 4 at MCM expo in London recently, but it was the high heel boots that got to me in the end, not the corset (which I wore to and from the con as well)
Sounds like you have curves in the right places and don't really need a corset and since its only a little bagginess at the waist, a whole new suit isn't really necessary, you just need to take it in a bit.