Vintage Long-Sleeve Classic Hickory Stripe Overshirt, White Tab, 100% Levis shirts.
In the days of the Old West, a type of heavyweight indigo or navy blue seersucker known as "hickory stripe" was used to make the overalls, work jackets and peaked caps of train engineers and railroad workers. It was later worn by butchers and employees of the gasoline companies, most notably Standard Oil. This cotton fabric was durable like denim, cheap to produce, kept the wearer cool in the hot cab of the steam locomotive, and obscured oil stains. Even today, the uniforms of American Union Pacific train drivers include "railroad stripe" caps based on those from the steam age.