National OOTD Day is observed every June 30 in the United States and encourages individuals to showcase their best personal style. This day, dedicated to the 'Outfit of the Day' trend, inspires fashion enthusiasts to express themselves through clothing by snapping photos and sharing their unique looks on social media. Participants are encouraged to use the hashtag #NationalOOTDDay and engage with a global community for style inspiration. Fashion retailers often capitalize on this day by offering special promotions and discounts, with brands like ASOS, Zappos, and Nordstrom typically participating. Individuals can plan their most stylish outfits, while creators and brands may host themed challenges or contests to drive engagement. The day was created by Stassi Schroeder, a reality television star, in 2018, based on her favorite hashtag.