No. The bit rules are on the USEF website. Basically it must be a smooth snaffles with no more than 2 links, no port and ay least 14mm thick (or 12mm I can't remember off the top of my head). D rings are fine, so are Os, eggbutts, full checks and b rings.
Honestly at the lower level shows no one cares if you are in a blue jacket and tan breeches. I show in tan breeches a lot because they are easier to keep clean. As long ad the jacket is dark, it is within the rules and you will need an approved safety helmet. I would start out at training level if I were you.
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