I am a size 18 and I ordered the 2x. It seemed a little large, so I threw it in the washer and dryer. It did shrink, making the button placket a little rumply, but it is now an excellent length (just slight past my natural waist). It's still slightly big around, but it's not terribly boxy as the ribbing at the bottom does draw it in. The shoulders seams are dropping slightly, so I will probably order a 1x next time.See full review