Bill Brown, the 1951 founding, and the giant hat
Bill Brown opened the original Hat stand in 1951 in what was then a relatively rural stretch of Glendora — the city was substantially smaller in 1951 than it is today, with extensive citrus groves and ranch land surrounding a compact downtown core. The choice of a walk-up roadside stand model was practical and conventional for the era: postwar Southern California was building out its car-centric retail infrastructure rapidly, and small walk-up stands along major roads served the growing population of car-owning suburban families. Route 66 was a busy regional road and the Glendora stretch was an accessible site for a new food business.
The giant fiberglass hat above the building was inspired in part by the postwar Southern California tradition of programmatic architecture — buildings shaped like the products they sold or designed to be visually arresting from a passing car. Glendora and surrounding Los Angeles County in 1951 still had numerous examples of this style: the Brown Derby restaurants downtown shaped like a hat, the Tail O' the Pup hot dog stand, and the Donut Hole donut shop in La Puente shaped like a giant donut. Bill Brown's hat signpost fit this tradition and proved durable as a brand visual.
The original Glendora location grew steadily across the 1950s and 1960s as Glendora itself grew. The pastrami sandwich emerged in the early years as the signature item that distinguished The Hat from generic burger-and-hot-dog stands. By the late 1960s the original Glendora location had built a substantial loyal customer base and Bill Brown began considering additional locations. The first expansion locations opened in the early 1970s, eventually growing into the current chain of roughly a dozen Hat locations across the greater Los Angeles area.