I am 5'6, 34c, 140 lbs and ordered the small. I have a trim athletic build and this burnout shirt is fitted well and still gives me some comfortable breathing room. I wear it with a thin tank underneath because it is a bit sheer. If you would like more room in this shirt then size up. Your normal size will make this shirt hug your body. It is a thin, light material and very soft. I have not washed it yet so I hope it holds up well. I ordered it in Black and Willow. Also, the company sends a follow up email to make sure you are 100% satisfied with the shirt. That was really cool - they care! I am probably going to buy another one. They are so versatile - day to day wear. Beach top. Night time when it is a little chilly. Working out/running. You won't be disappointed in these tops. They are also cute and sexy as well.