An ugly Christmas sweater is a type of sweater that is often considered to be tacky or hideous, but is also sometimes a source of pride for the wearer. The ugly Christmas sweater trend started in the 1980s and has continued to be popular in recent years. These sweaters typically feature bright colors, gaudy patterns, and a variety of holiday-themed imagery, such as Santa Claus, Christmas trees, reindeer, snowflakes, and more. They may also include lights, tinsel, and other embellishments.