I bought this in a size large back in late October in preparation of my daughter's birth Dec 11. (Well she ended up coming 3 weeks early)
I followed the sizing instructions to a T but when I returned home from the hospital and tried it on I was sorely disappointed as it was like I was trying on a corset meant for someone much smaller. I managed to get it on with some major discomfort and I was bulging from every direction. I am 5' 7" tall and was 145 lbs pre pregnancy and I put on about 45 lbs during my pregnancy, thus my decision to go with the large based on sizing instructions from the manufacturer.
 I'm not obese by any stretch so I'm pretty perturbed that the size large is such a poor fit. I'm out a LOT of money for something I can't use. Be advised: these run extremely small. If you are a XL woman you might be completely out of luck with this product. I was so excited at the thought of being able to possibly squeeze back into some of my pre-pregnancy jeans (or at least some of my early pregnancy jeans) with the help of this corset as it had gotten excellent reviews. I wish I could add to these great reviews. I get angry every time I see it sitting in my closet going unused.

02/05/12: I was contacted by customer service who assisted me in finding an amicable resolution. I have to hand it to Bellefit, they have EXCELLENT customer service. Don't hesitate to purchase from them based on that alone. Also the quality of the girdles and corsets they make are definitely top notch, which I neglected to mention in my original review.