The Bent Rod "Hoodlum Fishing Hat" with leather patch.
 
Both the Richardson 112 Trucker hat and the Pacific Trucker hat are one size fits all, snap back, and treated with Hat Saver to prevent sweat stains.
 
The Richardson 112 is the most popular brand of trucker hat and, therefore, a little higher in price. The only difference is that the Pacific hat costs less, so I'm passing that savings on to you!