This top is so precious. I love that it's a sweet (rather than sassy) look. My daughter is 13 and 5'3.5" and 105lbs, lean/athletic build and the Adult Small fits just right. I actually tried it on and I'm 5'7" and 124lbs 36A/B bra and the small was too short and too tight. I have a long torso, so if I were ever to wear this, I'd need a Medium or Large. Just hoping to offer sizing help!