Let's be honest, bathing suit shopping ****. It feels like each brand has a completely different way of sizing. I can be anywhere from a size small to large in swimwear depending on the brand. Whatsmode swimwear comes in pairs meaning you are buying the same size in both the top and bottom. I know, I knowwhen was the last time you were the same size in both a top and bottom? For some odd reason, it works. I ordered a size small in all of the bathing suits below. I am 5 4 and 135 pounds. FYI I'm only telling you that because I love you, no one likes to share that info. It was also extremely helpful to read the reviews on each bathing suit. Some of the reviews provided the person's height, weight and how it fit, which ultimately helped me choose my size in ordering. I am usually a medium in bathing suits so I was hesitant to order a size small.