I am so happy with this set! It's very comfortable and soft. I ordered a size Medium, I'm 5'6 and 135 lbs, and I like how it's a little big. I wouldn't want to wear anything tight while sleeping. I will say the bottoms are a little baggy, but again I don't mind that. If you want a tighter fit then I would suggest sizing down. I'm considering buying another one in a different style.