Do these have a "knobby" pattern on the inside to help hold in the flag and bean bag? My current pair does but they are several years old.
These shorts have a rubbery elastic waistband that not only help keep your shirt tucked in, but also helps keep your pants pulled up. It isn't a "knobby" pattern. However, it would help keep your flag and bean bag from falling out while running during a play.
Do your shorts have the S embroidered on the back belt loop.