OBSESSED!!!! To say the least. **** XS-S****** Color: Sheer Navy Blue and White I ordered and just got this gorgeous swim cover-up that I have been keeping an eye on for a month. Just got it this month. but unfortunately, it does not fit my arms as I work out and will need to re order in M. This beautiful cover-up will have you beach/pool ready. The cover has no stretch, and I think it would fit perfectly a size small with slimer physique and thinner arms. I also think it would fit a XS, if you want a little bit of room. The cover-up is meant to fit tight. NOTE: I'm not sure why, but the clothes from this brand don't tent to have a tag, but this is brand new. I purchased it on May 5th and got about two weeks later.