The first couple I tried on were tight, then I washed them all. I decided for me, its ok if they are a little tight. I work in the health industry and use them to maintain my modesty if I have a client that is trying to grab my shirt. I think they work better bring closer to my skin.
But then after that the last three I wore fit as expected. Im not sure if maybe the first day I was retaining water? Or maybe I got a few large? But there are a very good value and most of them fit well. They completely cover my bra and are long enough to cover most of my bottom. Which is important because I don't want my clients seeing my lower back when I bend over. I work with great people, but modesty is the best policy