Mrs. Claus Hat

Everything here comes out of Presents, so the set is locked to the Christmas event and to however many gift boxes you can shake loose before it ends. Enemies drop them, they stack, and opening a large batch at once beats cracking them one by one. A pre-Hardmode world gives slightly better odds per gift, so a fresh save in December is a reasonable place to grind it out.

Three cosmetic parts, all social slot, none of them touching anything you are fighting. Despite the name, male characters are not locked out: they get their own version of the art, so the heels and the rest work fine as a matching outfit for a whole server.

The internal name spells it Clause, with the extra letter on the end. Nothing in game shows it that way, and it only turns up if you go digging through the files yourself.