Other Terminology
Properly, the uniform is referred to as the official field uniform. An activity or utility uniform generally consists of a Scouting related T-shirt, polo shirt or other shirt, often customized with a unit design. Activity or utility uniforms are worn when the official field uniform is not appropriate for activities or as directed by the unit leaders.
Members sometimes refer to these classifications as class A and class B, respectively. Some units further distinguish a full class A or similar classification, that may include the wear of the merit badge sash, medals and the like. Such terminology is not used in any BSA publications and is officially discouraged, but the terms continue to be used by many members.
Read more about this topic: Uniform And Insignia Of The Boy Scouts Of America