I followed the measurements on the size chart and was in between sizes... so ordered both (1X & 2X). I wear an 18W in most clothing and the 1X fit much better. That being said, the compression wasn't great and didn't hold me in much, but was smoothing. The big issue for me was that even in trying it on, it didn't stay up and rolled down. There are a few inches of a sticky rubber on the top of the back, but it wasn't enough. Have to return them, as I know if it rolled down just standing in my room, it would never stay up and in place. I even tried to tuck the top up under my bra, but it didn't help.