 Modern updates to the traditional look include polar fleeces, hoodies, baseball caps, and knit caps.Straw hats, sailor caps and tarred waterproof hats are no longer in widespread civilian use, but wool or denim versions of the Greek fisherman's cap remain common.In the Old West era, Union Pacific train engineers and railroad workers wore distinctive overalls, caps and work jackets made from hickory stripe before boiler suits were invented in the early 20th century.