Bibs.

Often wear them with the straps down at waist level, like shorts. Use the straps over shoulders when needed. The straps keep the shorts (the shorts part of the bibs) in place, like suspenders.

Regular shorts IME shift around more. The bibs stay in place.

You can wear a shirt or baggy shorts or both over them, if and when you like (when shopping for example). They stay in place very well, so this is easy.