If I wear a corsette, will I get that "hourglass" shape?

I am athletic but more lean muscle, but the thing that bothers me is that I have an undefined waist. So basically, no matter how "slim" I am, my waist will be about the same width as my hips. Anyhow, if i wear a corsette, over time will my waist gradually get defined and be shaped into an hourglass? I'm not talking about short term, I mean long term, not just how my body will look while I'm wearing it. I'm 18. Thank you for answering.