Very flattering bottom!
I'm 5'9" and 165 lbs with an athletic frame -- thicker thighs, etc. I typically wear a M/L and a 8/10 in most pants, shorts, and underwear. I also have an incredibly difficult time finding flattering swim bottoms, so I was super stoked to have found these. I ordered a L and loved the fit -- not too tight but not too loose -- though I do think a M would have also fit. (Some L are NOT larges, but I do think this one actually is, just for any true-true L wearers out there!) They're extremely flattering -- very high waisted, went past my belly button, and hit right at my waist. The back is cheeky for sure, and the only con is they kinda go up my cheeks as I move around.
They're also extremely comfortable and great quality. I just wish there were all the OG patterns in this style -- neon green leopard, giraffe, etc., even the new '70s leopard that came out last year. Overall I highly recommend giving these a try!
Rated 1 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is As Expected and 2 is Runs Large