Wow, you sound like me! I do all my events except for one on the same horse. Lol.
Yes, it's fine to use your english clothes to show in. Mira's pretty much spot on about everything. Showmanship isn't about the horse's comfo. It's all about you showing the judge you know how to show the horse. So yeah, SELL IT! Haha, make everything really pointed and showy. Also, when the judge is walking past for his final "look", make your horse keep his ears forward and look perky and attentive. Don't make him keep his ears forward the whole class though, he'll get irritated and angsty. Showmanship judges have this HUUUUUGE thing going about straight lines. Even if your pivots suck or something, go through the parts that you aren't good at like it's not a big deal, and say he's awesome at setting up: really show that off. But whatever you do, keep EVERYTHING really straight. It helps me to picture a bright pink line drawn from the first cone or from the start to the judge, and stay on it the whole way. If you mess up and you know it, don't make a big deal out of it. Umm... don't take too long to set up your horse, only about 4-5 seconds. I know, it sounds fast but it's really quite a while. Ummm... what else.... OH! Keep your eyes up the WHOLE time. NEVER EVER EVER look at the ground. I know, it's really hard to keep eye contact with the judge the whole time, cause it feels like they're staring you down or something, but they really notice that. It's like you're saying, here look at me, I'm confident! Also, from the moment you enter the class, the judge has already picked out or is choosing her placings. So make a big deal out of attracting her eye to you. That's how showmanship judges judge is by picking out the winners and then looking for ways to fault them. But the fact remains that she's already found you out of all the others.
Lol, might as well write a book, huh? Sorry for it being so long, it's just... lol I Freaking LOVE showmanship and there's so much to it!
To rein a horse is not only to guide him,
but also to control his every movement.