I'm not sure if this is a planned feature of Disney Infinity, but it would be interesting to see.
In a NickToons game, there is a mechanoid named Jenny.
In her cartoon show, she usually had bluish green "clothing", but for a special party, she went to an autodetailer and got repainted red with a flame paintjob.
In the game, you had the ability to swap between her blue oufit and her red outfit.
That would be nice to see in Infinity, the ability to change the outfit of your character at a selection screen.
For most of them it wouldn't be practical, but for Mirage, it would be useful.
I've seen her in 3 different outfits, her business suit, her black dress and her battlesuit.
Those first two wouldn't be very good in action, but might have merit elsewhere, if she's not fighting.