Well this is quite the surprise! The currently Japanese-only game Hero Bank 2 on 3DS has a demo you can obtain via the newest issue of Coro Coro magazine (Pokemon fans should be very familiar with this magazine as it’s usually the place where news first ever appears in) via a QR code, and if you do this and then buy the full game, you can unlock actual models as costumes in the game, as shown on the game’s website!
Very special thanks to Impotaku at NeoGAF for the heads up!