If you want to pick out your favorite design with a square cut you could go for whichever design you want then (carefully remove the liner if you want a good amount of bulge.

For extremely small suits that don't have your whole butt out i would recommend mategear for the good quality, bright colors, and high quality. Due to the sturdy construction and extreme low rise you would do well to be at a nude beach if you get too much of a bulge since there really is not much room in front.

I'm wearing the mategear ultra here