All crew members are required to wear the same uniform while out on patrol. Currently, Working Blues and ODU 's are considered the same uniform.
If your District/Sector permits shorts, then all member would need to be in Shorts. If they are permitted to wear T-Shirts, then all must wear T-Shirts.
Exceptions to the above are:
Tilley hats and ball caps are equivalent
Boat shoes (regardless of color) and Super Boots are equivalent
CG Approved PFDs that can be worn on Patrol are equivalent
Approved Float Coats and Mustangs are equivalent