I don't and you wont catch me doing it either. I find it's WAY more simple to just clip. There is a bit of a strange boarder at the barn who does it with 2 of her horses. They are boarded inside and are covered year around in at least 2 blankets. A horse is a horse, let them be. I don't understand the need to put them thru so much not mentioning the light 24/7 because you don't want to clip a horse
I've seen one other time and once again it was in a western rider. I guess part of that riding world I will never understand.