Also, I have a rather rotund pony and a treeless saddle. I haven't had any major issues with slipping, but I don't really want to risk it either. I was wondering whether it would make sense for me to use a breastplate? I know they keep a saddle from sliding back, but do they also help prevent slipping off to the side?
Finally, as a dressage rider, would I look crazy to use a breastplate?