Fans of Chevy Chase and his iconic character Clark W. Griswold from the National Lampoon’s movies will appreciate this fun Clark Griswold Christmas Vacation ugly Christmas sweater. This Clark Griswold Christmas Vacation ugly sweater costume is fun, warm, comfortable and is neutral enough that you can wear it to your next holiday party with friends and family and not worry about it offending anyone or having to spend hours explaining it.  (It's still so famous that you'll feel like one of Santa's favorite elves who's just gotten tipsy at the bar.)