National Argyle Day is observed worldwide on January 8, celebrating the iconic argyle pattern, which originated in Scotland. The pattern, characterized by diamonds and intercrossing diagonal lines, is named after the historic county of Argyll, home to Clan Campbell. Argyle became fashionable outside of Scotland in the early 20th century, popularized by the fashion brand Pringle of Scotland and figures like Prince Edward and golfer Payne Stewart. Celebrations typically involve wearing argyle clothing, such as socks, sweaters, or vests, and can include Scottish-themed parties with an argyle dress code. Participants may also share their favorite argyle patterns on social media using hashtags like #NationalArgyleDay. National Argyle Day was created by Keely McAleer in 2008.