This may have been suggested before, I'm not sure. But if anyone here plays Lioden and uses the wardrobe function there I believe it would be a really cool feature to add on here. A wardrobe to display your own pets from your account and preview every single item that has ever been released on the site to see what different combos would look like. I know that I wish it was possible to try different things on at the same time in the C$ store along with items from your own item hoard when you have a certain idea in mind but you're missing certain items and you want to know what exactly it would look like.
I think it would come in handy for when there are things in the shop you like but you have a specific pet in mind for said item and you want to see what it would look like on that pet before you buy it to make sure you really want it or not. The closest we have to a feature like this is the dressup scenes with other people. I suppose you can ask to try on other people's items in a scene but that sounds like a real hassle. An item wardrobe preview feature sounds like an absolute dream for the people who have specific themes and visions for their own pets and how they want to dress them up with items they don't have!