I love this romper! Sooo cute and comfortable! I'm 5'7 and 145lbs, muscular build & very small bust. I ordered the large. I probably could have gotten away with the Med. I was afraid of it running small based off the other reviews. I love the tassel detail on the strings that tie around the neck and behind the back . This romper can be worn several different ways. I also love that the hips cinch up as well, which allows you to adjust the length a little bit. The elastic is nice in the waist. Could be much tighter on me, but that is because I got a large and I have a smaller waist.