Levi Strauss Day is celebrated on February 26, honoring the founder of Levi Strauss & Co., the first company to produce blue jeans. This day coincides with Strauss's birthday and recognizes his significant contributions to the fashion industry. Strauss, originally from Germany, moved to the United States and established his wholesale business in San Francisco, where he later partnered with tailor Jacob W. Davis to create the iconic riveted denim pants. The celebration typically involves acknowledging the impact of Levi's jeans on fashion and culture, as many people have worn them at some point in their lives. While specific customs for the day are not detailed in the text, it serves as a reminder of the brand's historical significance and its enduring popularity.