I made my banner to be more shady, because this is a medieval war game, not a fashion show
Medieval times were actually quite flashy. Dyes were expensive, so the rich people used them excessively. Grit and gore were part of it, too, of course, but I actually kind of like the contrast of bright colors on the nobles and dirty rags on the beggars. The idea that medieval times have to be filmed through a brown and grey filter are recent and foolish.