Rappy Suit + Accessories?

It’s hilarious, but can somebody please explain this?
How do you add enlarged accessories over costumes?
Is there a trick to it? Is it unique to the Rappy Suit or does it work with the Casino Lillipa as well?

It's just a Rappy Mini Suit thing. They are the only "mascot" Outfits that can use accessories and because of their unusual proportions, the scaling on accessories is greatly exaggerated.