I purchased a size medium my usual size, and it was perfect. For reference, I'm 5"3, 145 lbs, 36C, and I have a 30 waist. I live the aqua color, and the jewels make it look so beautiful on tan color skin. I was so obsessed that I kept looking at myself in the mirror for about 30 minutes, lol. Call me crazy. I definitely recommend you won't regret it. Also, the straps are adjustable like a bra, which makes the comfort to it actually nice. Overall, I ❤️ this bikini.