Keep warm and comfortable this holiday season when you enjoy your visiting family at Christmas while you wear this officially licensed National Lampoon's Christmas Vacation Pajamas. Remember when Clark snuck up into the Griswold attic to enjoy his old home movies?? These Christmas Vacation Movie Pajamas are hilarious, the perfect way to show off your holiday cheer, while at the same time show everyone that your favorite holiday movie is National Lampoon's Christmas Vacation starring Chevy Chase.