Guild Wars 2

It was a gift, now you’re charging us to use said gift? Surely this has to be a bug.

I think when ‘converting’ the witch hat (and similar items), you got 2 different things:
a) the triple unlock of the skin (which shows in your wardrobe and it costs one charge to transmute your current hat into looking like the witch hat)
b) an account-bound witch hat-item in your inventory
When I click ‘use’ on said inventory-item, I seem to get an option to put on the witch-hat (apparently without any stats) at 0 charges.
So it seems the gift-nature of the hat remains intact (as long as you just use the hat and don’t use the skin to transmute another item)