I think I only ever needed a white shirt and tie. My younger brother was in band but when they performed with the string orchestra to give more of a symphony I think they actually did have some sort of suit, maybe tuxedo-like. That was all arranged by the school at the very start, of course.
Orchestra
My school orchestra only needed all black with a red tie, a tux seems kind of excessive.
I think I only ever needed a white shirt and tie. My younger brother was in band but when they performed with the string orchestra to give more of a symphony I think they actually did have some sort of suit, maybe tuxedo-like. That was all arranged by the school at the very start, of course.