When the show hack classes first hit the US, they were not saddle seat horses in dressage clothing.
they were ridden the way you might expect a dressage horse to go in a rail class.
And you had to strip the horse for conformation judging.
Then the main ring trainers “discovered” the class.
Now it’s such a parody that they’ve had to peel off into “sport horse show hack” vs plain “show hack”.