Cat Mask

Every part of this comes out of Goodie Bags, which only exist while Halloween is running in your world. Any enemy can drop one in that window, so the quickest route is an ordinary spawn farm with a Battle Potion up rather than hunting anything in particular.

Each bag rolls one item off a long table, and the three cat pieces roll independently. Expect a pile of duplicates before the last part shows up.

The headgear gives you ears and the outfit adds a tail, which the game draws in the layer it uses for back accessories. Vanity wings or a cape will crowd it in that same space, so pick one or the other.

Nothing in the set touches your stats. All of it is social slot only, and the pieces mix cleanly with parts from other costumes if you only want the ears.