All showing can be done inhand or ridden unless it's for horses n ponies under 4years or minitures as far as I knew. I'm really wanting to know what the correct tack and equipment is for each class? Double bridle? Snaffle? Flash or no flash? Plaited? Etc etc?
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I'm not terribly familiar with the sporthorse specific world, so take my advice for what it's worth. Fair warning.
I would show the horse in whatever gear he's used to wearing. If he's used to the double, lead him in the double. After a quick Google, I see most wearing a keuring bridle type setup, but I also seem to be looking at upper-level horses. I expect that a clean, well fitting snaffle bridle would be fine. I would say no flash. Definitely plait, mane and tail.
As far as what type of horse, almost any breed typically competing in jumping, eventing, or dressage has a sporthorse division. Also, I've seen Arab sporthorses, Friesian sporthorses, sportponies, etc. Breeds like QH, Paints, or gaiteds do not. I don't know what kind of registration or breed affiliation the horse needs.