Yeah, can't help but wonder about those bridled saddles whenever they show them. They even stuck this most recent one large in the foreground right next to Rarity, like they specifically want you to imagine her wearing it.
Just watch, they'll finally show a pony wearing one of those outfits in the show, and it'll turn out it's just meant for parents carrying foals around on their back.
So I wasn't the only one to wonder what the heck was up with that outfit on the mannequin in the last episode. Seriously -- in a world full of ponies and no humans, what the heck are we supposed to make of a bridle and a fur-trimmed saddle with metal studs?
Interestingly enough, that outfit is another one of thoe things that just pop up in the background of Rarity's boutique every other episode. I'm pretty convinced that she does "specialty items" on the side.