I bought this swimdress using the size guide. I chose the size that matched my measurements. I got the suit and it was lovely, but it was too big. It felt nice on hips and tummy, but it had no breast support and the straps were loose like they will come off in the water since we girls know how buoyant we are! :) I LOVE the quality of the fabric though! I was extremely surprised to see how much sturdier the fabric seemed than a walmart swim suit. And I have been a Catalina fan for years! Sadly I had to return this suit and then my size was sold out. I did finally get one in my size, it took a while. It was worth the wait. I bought this for casual summer swimming and 1 ocean trip my husband and I are taking this June. We almost ran out of time to get a replacement suit. I bought the blue one instead of the polka dotted one.