It is so very, very easy to find tack holiday sweaters. Just go to your local thrift store around the holiday season and I guarantee that you'll find more than 5! If you are lucky you may find one that lights up!!! Sweater vests are also popular for tacky sweaters, they add a little extra tackiness. It is super easy to add to a tacky sweater to make it even more outrageous by going to the craft store and buying holiday scrapbook decorations and glue or sew them onto the sweater.