Milkmade Hat

Attempting to equip your pigman/bunnyman/merm/splumonkey with a milkmade had will just result in them having the hat in their inventory indefinitely. You can give them 16 hats until their apparent inventory is full.

If your follower was already wearing a hat or helmet, then the milkmade hat trade will force the headwear to come off, even though the follower does not then equip the milkmade hat.