If you've been to an "Ugly Christmas Sweater" party, you know the deal. Find a heinous old-school Christmas sweater, and wear it with pride: Puff paint, embroidered reindeer, dangling snowballs made of cotton, maybe some ribbon.
And now there's a song in honor of the fashion emergency known as the Christmas sweater. You can find it on YouTube titled appropriately, "Ugly Sweater" by Mistletoe Conspiracy. It came out last year, but it's timeless.