Actually, in all honesty, I think that new costume works for Melon. As for the (likely soft foam) headpiece? Well, it's the sort of thing Melon would do, isn't it? I do like Yemisi's "Hey, the customer is always right, no matter how otherworldly their choices" shrug. No-one has ever asked her to dissuade them from giving her money before!
Interesting how Yay is moving in panel 2. I'm wondering if this instance really has decided to try to be more feminine in presentation and found that they like it? Maybe, after long enough associating with Roko, this instance will be somewhat desynchronised from the others in behaviour?