I got it in medium based on a previous reviewer saying that she is 125 lbs and around 5'2" (which is my height and my weight), and the medium size is too loose! The waist band goes up way too high, I think I can pull it over my chest if I wanted to, so I'd wish it were lower waisted.  The leg length is too long, and these are tights, it's not like you can fold them if they're too long. I didn't bother returning them. I might give it away to someone else. But the material seems pretty thick, but can get see-through if stretched.