I understand this is more than a year later, and you probably already know this, but this avatar was already posted here -> https://forum.ripper.store/topic/26555/fl-all-avatars-cupkake
Just in case someone comes by this looking for it.
Idk where to buy it but I found it in a public world a few weeks back. https://vrchat.com/home/launch?worldId=wrld_44e858f8-ce23-4f5e-8421-4c22101b683e
