I think that there are a lot of items in SK that you dream of but you can never get.
So they should make try-out items. Only visible to you and for a limited time only. Anyone else will just see you with what you were previously wearing before you got a try-out item. This wouldn't be a very hard thing to update either, as all they have to do is give you a 'try out' button on items and make them limited.
This way people can try items, if they don't like them, they wouldn't have to spend loads of crowns just to be disappointed.
This wouldn't be possible with weapons though, as they effect the damage, the charge and a lot of other stuff.
I don't see why not.