The dark side is fun, I made the switch 2 years ago, and I won't ever go back. The eventing folk are so much more friendly than Hunters. On your way to XC everyone will be wishing you luck and warning you of footing changes.
A trick with the vests... let it sit in your car and get warm before you put it on or groom with it on. I've found once they are warmed up they mold better to you. Helps big time when you first start riding with one.
Make sure your helmet also meets safety regulations. No harness-less or removable harnesses.
If your horse says no, you either asked the wrong question or asked the question wrong
And God took a handful of southerly wind, blew His breath over it and created the horse