That's some crazy outfit lmao. Can't wait for her to join the harem team. Bet it's gonna be even more hilarious/chaotic. Considering how much of a tsundere she already is.
After Grande became human that outfit was the only clothing that Kosuke can make that will keep her from walking around in the nude(when she finally takes human form, he body is more filled out than both Ira or the Harpies)… also the only clothing that she won’t rip up from everyday wear and use.
Later on Ira and Melty joke with Kosuke that they might want to try to wear Grande’s same outfit for Kosuke in the bedroom for him as well!