I am 225lbs, 5'8 my waist measures at 40 inches. I went with the 2x and it fits great. the first time putting it on my husband has to hook it for me and i keep it on for abut 30 mintues. the next day I put it on by myself and wore it to the gym to workout in and it felt great. I want to get another to sear under my cloths as I look so good with it on in the gym. hope this helps for someone