The ubiquitous clothing retailer Gap has been filling closets with jeans and khakis, T-shirts, and poplin since the Woodstock era. The firm, which operates about 3,750 stores worldwide, built its iconic casual brand on basics for men, women, and children, but over the years has expanded through the urban chic chain Banana Republic, family budgeteer Old Navy, online-only retailer Piperlime, and Athleta, a purveyor of activewear. Other brand extensions include GapBody, GapKids, and babyGap; each also has its own online incarnation. All Gap clothing is private-label merchandise made exclusively for the company. From the design board to store displays, Gap controls all aspects of its trademark casual look.