This sweater is describe by those who are selling it as: "Tiara Unisex Lightup Creepy Bears Ugly Christmas Sweater". Really "ugly" is in the description? That's definitely what I look for in clothing.
I can't even imagine what this dude was thinking. Obviously, it was not with his brain. source: http://www.dumpaday.com/wp-content/uploads/2012/12/christmas-sweaters-funny-pictures.jpg
Then of course, you can always get a holiday sweater intended to be creepy like these:
Now this place looks like it really got its creepy on. You can get an angry snowmen, Krampus or skull sweater here
This store also has really fun Krampus and Lovecraft sweaters - perfect for your holiday creep