Krampus - called the devil of Christmas - is one of the companions of Saint Nicholas. The character of Krampus has been imported and modified for various North American media.
Krampus is a popular Halloween costume character for those dress up activities. In the time of virtual gatherings, what's on top counts, so a colorful t-shirt will do the trick, or, treat.
Both come in a variety of spooky colors. And priced to not spook you - $15.97 and Free shipping on US domestic orders.