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I bought a small and medium for my daughters who normally wear an XS and M. The small fit my youngest daughter really good but was a little tight in the lower stomach/hip area. the same was true with the M but it was a even tighter in the waist/stomach area to the point you could see some of the stretch. Since my youngest daughter is extremely skinny with no gut I'd have to say they run a little small.. However I'm hesitant to say that because it was loose everywhere else and made her shape look so amazing that I think going up a size would have been too big. While my older daughter is skinny she does have a little stomach on her (usually impossible to notice unless in a 2pc) so it made a little more sense. Point is the cover up is pulled in at the stomach a little too much so you may want to size up if you are ok with it being baggy or just deal with it, if your stomach isn't that big, because its so cute. But if like me with a big stomach just walk away. It's also comfortable to the point my daughters have been wearing them around the house since we got back from vacation. They are also 5'7 and the cover-ups lay right at their knees...yes they are both 5'7 and both sizes were the same length.