I currently have 2 - a cardigan & a vest. (I used to have more, but, over the years, have gotten rid of them for various reasons.)
Besides the 2 Christmas sweaters, I also have 1 Christmas-red cardigan & 1 Christmas-green cardigan that I wear all the time during the holiday season.
I have several Christmas t-shirts, both long & short-sleeved, which I tend to wear more than the Christmas-themed sweaters.
I also have 3 pairs of Christmas leggings, several pairs of Christmas socks, a reindeer antlers headband, & a wirly-q Santa hat that makes me think of Cindy Lu Who.