Lee is an American brand of denim jeans, first produced in 1889 in Salina, Kansas. The company was formed by Henry David Lee as the Lee Mercantile Company originally producing dungarees and jackets. The growth of Lee was prompted by the introduction of the Union-All work jumpsuit in 1913 and their first overall in 1920. Later in the 1920s Lee introduced a zipper fly and continued to expand. Around this time, the first children's overall line was sold. During the 1930s and 1940s the company became the leading manufacturer of work clothes . In 1944, the Lazy "S" became the official Lee back pocket. In 1954, Lee expanded into casual wear. In the 1970s Lee shifted its focus from the workwear business and began catering to fashion styles.