When I used to play in brass bands, a waistcoat was always offered as the percussionist alternative to a full on jacket.
Wore one once, looked like an absolute dickhead, just went shirted from then on. The last band I was in (the really good one) just wore DJs anyway, which I was happy to wear because I looked dapper AF.
I did however have to wear a lot of bow ties, which we can all agree make everyone look like a massive tool.