Santa's Hat: Santa was going to say you were naughty this year, it's a shame you got to him first…
Stat Bonus: +15 Luck +50 HP
Fame Bonus: ??? (unlisted)
Not available as a drop.
Wear Santa's Hat when playing on a highly valued character, since it is a limited item. Santa's Hat gives more Luck than Rabbit's Foot and increases HP too.
Santa's Hat were made available for Christmas on December 25, 2015 and could be bought within 5 days. They cost 0 gold, but were Soulbound and only available for purchase once per account.
As of July 29, 2016, all accounts were wiped meaning any remaining Santa Hats are rid of, and there are no further plans for them to be released any time soon.