My company had a contract to deliver uniforms, shop towels, and restroom supplies to Standard Oil stations, but the Chevron dealers could sign with an industrial laundry of their choice. This was a very labor-intensive service, as the uniforms were washed, starched, pressed and folded, and then wrapped in individual bundles tied with a string. Eventually Standard changed to blue shirts and pants, which were no longer folded but placed on hangers instead.
I never saw the khaki uniforms shown in the film, since our dealers also wore white.