The History of Ugly Christmasbr Sweaters: Explained.br Every year on Dec. 20, people from all across thebr United States celebrate Ugly Christmas Sweater Day. .br While there isn’t an exact definition of what isbr considered an ugly sweater, the general consensusbr is the more embellishments, the uglier the sweater.br However, these types of sweaters weren’tbr always considered ugly. In the 1980s, theybr were popularly worn on sitcoms. .br It was around the same time that thebr Christmas element was added, withbr “jingle bell sweaters” becoming abr mass-produced, hot commodity. .br As fashion trends changed, so did the conceptbr of ugly versus stylish, and the sweaters were br quickly considered tacky and in bad taste. .br In terms of the trend of purposefully wearingbr ugly Christmas sweaters, Vancouver, Canada,br claims to be the concept’s birthplace. .br Since 2002, the city has held an Original Uglybr Christmas Sweater party at the Commodore Ballroom.br Every guest is required to wear an ugly sweater. .br The co-founders of the event, Chris Boydbr and Jordan Birch, even own the trademarksbr for the phrases “ugly Christmas sweater”br and “ugly Christmas sweater party.