If you're not sure, always size up! Also remember that sometimes your butt size doesn't align with the rest of your clothing size. Obviously, know thine butt: if you have a big butt relative to the rest of your bod, get a size bigger than your regular clothing size! I usually wear an S for pants, but I wear a medium for these guys.
| US size | UK size | Buttercup size |
| 0 - 2 | 4 - 6 | XS |
| 4 | 8 | S |
| 6 | 10 | M |
| 8 | 12 | L |
| 10 | 14 | XL |