This has been a fun thread. I know things are different in the States than here, but lol at some of the mental images I have!
We have always done, Leo (we call them gym suits here btw), warm up (we call those track suits), hair up in some type of bun and tight but no mandatory style, and the gym suits always come with a matching scrunchie that goes around the bun. Oh and white socks for march in and awards, and the gym bag.
Dd used to use glitter spray (just a bit) because it was what all the little kids did.