I am 5'3" and 210 pounds, and ordered an 18W. It fits fine, but arm holes are a little bigger than shown in the model photo. Shorts offer no tummy control at all, so don't buy this swimsuit for that purpose. The shorts also ride up on my thunder thighs, but maybe they stay in place for someone smaller in that area. I'm keeping this one, but it's not the perfect swimsuit.See full review