I usually buy an XL but after reading the reviews I ordered the Lg.  Perfect!  I love the fact that the band at the bottom can be positioned under my chubby tummy and will stay put.  You could easily wear this pulled down if you wanted.  The top doesn't look like much in the photo but it is very flattering for hiding a thick tummy area.  I will be ordering another one!  For sizing reference, I'm 5'8", 170 lbs, 40C bra with a  short, thick waistline.  The Lg is perfect for me