I usually wear a medium or large in retailer clothes. i purchased this in a large and it fit perfectly. it is a clingier top but i didn't find it too much so. the ribbing makes it very attractive and slimming, and also can be worn as a stand alone turtleneck or easily as a layered piece. it is super soft and comfy as others have mentioned, and a tad thicker than just a cotton turtleneck would be - it has substance. also, it would be great for traveling because it doesn't wrinkle at all. love that!