I ordered the XS, which is described as US XS/Tag S. It does not fit like an XS, very boxy in the body and loose in the sleeves. I would order a size down next time if I had the option, but it looks fine, just a different more casual aesthetic. As others have said, it is not cotton despite the name. It is a poly that wrinkles easily. I got it in white, and you can see whatever I'm wearing underneath, especially on the sleeves. All that being said, it's cute. I get compliments at work. I will probably buy another color.