Nice, I was looking at those just the other day and thinking they'd be useful for outfits that needed cloth wristbands. There isn't anything else similar, except the bulkier leather wristbands and cuffs.
The rabbit ears were also critical for a White Rabbit costume I made for my Elezen. The coat and pants are both male-only gear, and I think I had the idea since before - or certainly as soon as - they announced they were making the outfits available to male characters.
Pity about that tiara though. Maybe if he looks serious enough, people won't remark on it.
So yeah. No interest in wearing the bunny suit itself, but there are still other reasons to want it unlocked. A pity it hasn't led to other items being unlocked as well.