For breeches "the tailored sportsman" for all things western "hobby horse"
Samshield for helmet, tailored sportsmans for show pants, R.j classic for show coat
Kerrits has a lot of stuff, and they have really cheap items. Piper breeches from smartpak are cheap and one of my favourites!
I love Pikeur but it can be expensive. For breeches I love Easy Rider ones from Euro-Star ;)