I wear XL in Simply Vera Vera Wang pajamas from Kohl's. I am about a size 16-18, and do not wear snug fitting clothing. This shirt is tagged an XL, but you will probably need to be a US size 12 to fit it, maybe a size 14. If you are a size 16, don't bother, or size up. I don't want to be this weight, and I am always trying to lose weight, so I am keeping it. I should have returned it. I have enough clothes that are too small.See full review