Oh hell, I earned my bronze and a regional championship at third in a navy coat and field boots and black VELVET pads, because the black looked so good on this grey mare and the next mare. Training through second with tan breeches.
I can say, and I’ve scribed enough to say, judges don’t care what you’re wearing if you’re reasonably following the rules… Sharp turnout can catch their eye but it won’t save you from a bad ride.