So there was a reviewing warning not to size up on this. but I knew better, so I sized up anyways cause I have a big butt and FN swimwear never fit my butt and I’m SO glad I did. I got an XL instead of my normal L and it’s still a little snug on the bottom. However the top fit just right once I adjusted the ties. I can’t say for sure if you should size up or down. This piece definitely depends on your body type so I would say purchase at your own risk.

Get your usual size. Got a large due to reviews and bottom fit like a diaper. I have a curvy bottom so went a size up but that was a mistake. Now I can’t return :(