I always wondered how they kept their shirts tucked in.
They have snaps like a baby onesie.
Interesting. I've always been amazed that gymnastics shorts can be so small and yet still keep the wearer's junk contained so well that you rarely get to see anything. But maybe it's not the cut of the shorts, but the "baby onesie" shirts. Maybe the reason I never realized it before is because the shorts and shirt are often the same color.
For example: