Martin Luther Sock Day originated as a humorous suggestion in Chicago in 2011, evolving into an annual tradition of replacing worn-out socks and underwear while donating old items to charity. The event's popularity grew through social media and local participation, expanding beyond Chicago to other cities. It's now a community-driven initiative combining practical self-care with charitable giving, reflecting Chicago's spirit and honoring Martin Luther King Jr.'s legacy of service. The tradition emphasizes renewal, dignity, and community engagement through a simple, accessible act.