Tail

The tail has no recipe. A level 3 Thrifter sells it for 9 emeralds, but not every one does: a villager gets 2 of the 7 level 3 trades.

It adds 1 block to safe fall distance.

Since 0.3.0 it reacts to what happens to you. It puffs up when a creeper within 12 blocks starts to swell and when you take damage. It wags while your own tamed pet is within 8 blocks and after someone gives you a headpat. It twitches while the caffeine from Byte Energy lasts. Other players see all of this. The client option "Reactive ears and tails" turns the reactions off, and "Tail/skirt physics" sets the sway to full, simple or off.

Nothing else goes in the Tail slot, so wearing it never costs you another item.

The Wandering Cosplayer may sell a tail in the Witchy colorway for 2 Style Coupons, one in stock.