It's funny you should mention this.
I used to think a corset would help cinch in my humongous stomach and make me look sexier. I even ordered one from ebay but it was too big and I felt (and looked) stupid in it.
There really is no point cinching your waist in, not being able to breathe, all for the sake of looking like you'd look anyway with the help of some exercise and a good
diet - that's the conclusion I've come to. After years of holding in my stomach to appear slimmer (and I couldn't breathe all the while) I've said screw that. I want to be comfortable and wear comfortable things and still look good. I don't want to have to wear specially engineered clothes to make myself look slimmer - it doesn't exactly work with my big boobs and thunder thighs anyway.
It's up to you if you want to go ahead with this. But just realise it's not all it's hyped up to be.