I love that this is 100% cotton! I keep my clothes a long time and have found that ones with spandex mixed in lose their shape over time. It's a slim fit that comes just past my belly button. I often wear a small in these days of size inflation, but I ordered a medium and it fits well, like shirts from the 90s. If you like a roomier fit, though, definitely size up one from your old size or two from your modern size. (In contrast, I took a small in the relaxed cotton boat-neck, and it was still much, much roomier than this medium.) 5'9", 28" waist, 18" shoulders