I'm 5.1 140 lbs with a small bust area. I was worried about the small being too tight but the medium being baggy so I went with the small and it's perfect. It's not skin tight like I imagined. If I had bigger boobs To fill it out then it would fit a little better but I'm happy. I can wear it with some jeans to go out or to just lounge around the house. Oh and it's sooo soft!!