Have the hap-hap-happiest Christmas in this starry bandana! Also works perfectly for New Years Eve! 100% natural cotton XS - Up to 10 inch neckS - Up to 13 inch neck M - Up to 15 inch neck L - Up to 20 inch neck Name Origin: A family Christmas tradition of mine is watching National Lampoon's Christmas Vacation. Clark, the father, says, "We're gonna press on, and we're gonna have the hap, hap, happiest Christmas since Bing Crosby tap-danced with Danny... Kaye!" as he's in the midst of some christmas-family related drama.