This shirt is tighter than some other ones, and therefore more effective. The waist slimming belt is not the best, because it's not optional and it causes a crease line look through clothes. Ultimately, this shirt did not work for me; maybe my stomach is just too big.
It is an in between size. Going from a men's small shirt size, and using the size chart for the product told me I would be better fit by the medium, but its very tight and difficult to take off once you put it on. The large would have been two loose and therefore completely ineffective. i would not recommend this product. I would suggest going to a medical supply or department store and have the ability to try it on than be disappointed, even though it may cost a little more to do so in terms of time and money.