I chose to upsize in the brief as I often do when purchasing two piece swimwear. I probably didn't really need to, but due to the design of these great briefs, I am able to reverse them (literally wear them back to front!) for better tummy coverage now I have a meno tummy. Love that you can pull them higher for a high cut over the butt or wear it lower for more seat coverage. The reversible fabric is great and the finish on the seams is absolutely first class. I wore these recently in the surf and they didn't ride up or bag when wet. Fab pants