What a marching band wears during public performances to look the same. Consists of bibbers, a jacket, a hat and a plume/feather. Hats are usually shakos, Aussies or helmets. Some groups will also use gauntlets on the lower arm, up to the wrist.
A really comfortable piece of clothing that anyone from a band geek to a band addict wants to wear out and about to showcase how much of a nerd they are. Also works as pajamas.
Wow! You look really sharp in your marching band uniform!
You need to put your marching band uniform on the competition/football game.
I am going to put on my marching band uniform and drive around with the windows down blasting Les Misérables.