I think I know how this outfit came about:

[recklessly navigating past the pallets of feathers and tulle in the H!P wardrobe dungeon, two Apprentice Bedazzler Technicians collide]

A: “You got your cheerleader outfit in my candy-striper uniform!”

B: “No, you got your candy-striper uniform in my cheerleader outfit.”

Together: “Heeeeeeeey!”

For once, I’m not complaining. And she’s 19, so I don’t feel completely creepy about looking at a sweaty, scantily-clad Sayumi Michishige.