I show at local level in ridden coloured classes. I wear a shirt and tie with a blue tweed cutaway jacket. I normally wear beige or yellow(ish) jodphurs and carry a cane. velvet hat is important.
I was told its important to look the part even if you feel like a turd! (and are totally overheating in all that ****** tweed!)
Good luck!! Have fun!
x x x:D