Summoner's Cat outfit

[Alchemi]

Hello, I just started playing recent, and I'm not sure if this is the right place to ask this question. I'm wondering about a particular outfit for the Familiar, the one where it's wearing headphones. I've been looking around trying to find out how to get it, but I can't seem to any information on it. Can someone please tell me about this outfit, and how I can go about getting it?

[Ripley]

I think it`s not accessible in the game at the moment