Fits as expected. I wear a medium/large top depending on the brand. I bought a large coral color for this. My bust is 39 inches. Height 5 feet 5 inches. This shirt fits how I expect it to fit and is large. Loose enough not to compress my mom's fat, but not so loose that I swim in the fabric. Maybe using a medium to float would be better so it sticks better. Now for the thickness of the fabric. I have an average weight. My bikini top is red with white polka dots and I can see the polka dot pattern through this rashguard. I don't think less obvious patterns or colors will show through the fabric, but red with white dots definitely shows through this one.
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