You poor thing. I used to do lower level eventing on my old horse... Once we were moving, we were fine, but he couldn't halt for the life of him. Had issues with stnading still. One test we did, we travelled to the side of the arena sidestepping and mini-rearing... Lucky that horse could jump!
There is a lot of mis-information here about Australia. We have dressage organisations seperate from PC, and everyone is turned out correctly at these competitions regardless of level. PC comps have standards of presentation, but at club level, they won't kick someone out for not plaiting. At zone or state level, I have NEVER seen a horse not correctly presented.
PC rules state no breastplates, martingales, boots etc. in dressage, so if they are used, it is in violation of the rules. I can't speak for the open dressage associations as I don't compete with them.