National Flannel Day is celebrated on February 10th, honoring the warmth and style of flannel fabric. This day encourages people to wear their favorite flannel clothing, participate in flannel-themed activities, and appreciate the fabric's rich history. Common customs include hosting flannel fashion shows, cozy movie marathons, and crafting sessions where participants can create flannel-themed items. Additionally, gatherings often feature flannel-themed potluck dinners and trivia nights focused on flannel's cultural significance. The day serves as a reminder of flannel's versatility, from its origins in Wales to its popularity in American workwear and grunge fashion. Overall, National Flannel Day brings together flannel enthusiasts to celebrate this beloved fabric.