Teams most commonly all wear the same uniform. We have had teams wear a variety though, displaying all the uniforms in one image can be cool. It is important to make the decision on who will wear which uniforms prior to the session and should be discussed with the photographer in order to prepare for proper balance in the final image. Belts, shin guards, cleats, tucked in shirts; if one wears, all should wear.
Balls, bats, helmets, gloves, batting gloves; bring them. Not all players will use them but all should have them and be prepared to use them. METAL CLEATS ARE NOT TO BE WORN IN THE STUDIO!