A History of Hickory Denim
Long before Hickory Denim found its way onto a hat, it was standard issue on the American railroad.
The pattern dates back to the late 1800s, when the industrial revolution and the expansion of the rail system created a demand nobody had solved for yet - clothing tough enough to survive a full day of hard labor and still hold up the next. Textile manufacturers answered with a handful of heavy, durable fabrics, denim among them, but one pattern in particular became inseparable from the job itself.
Standard Issue on the Rails
Railroad engineers, brakemen, and conductors wore Hickory Denim overalls, jackets, and caps as they operated coal-fired locomotives, shoveled fuel, and worked long shifts in the kind of conditions that ended most fabrics quickly. It wasn't chosen for how it looked. The tightly woven cotton construction was built to survive repeated wear and frequent washing, and the vertical stripe running through it served a practical purpose. Hiding the oil, grease, and soot that came standard with the work.
The name itself came from hickory wood, prized for its strength and resistance to wear. The fabric earned the comparison. Woven densely enough to hold up under constant friction and strain, Hickory Denim became a shorthand for reliability long before "workwear" was a category anyone marketed.
By the early 1900s, the pattern had become so closely tied to the railroad that it functioned almost like an informal uniform, a way to recognize the people keeping the country's rail lines running. Companies leaned into it. Some of the earliest workwear brands built entire product lines around the fabric, and by 1920, the pattern had made its way onto more than just overalls.
Beyond the Railroad
As industries expanded and diversified through the 20th century, Hickory Denim expanded with them. Mechanics working under cars, farmers working the land, carpenters on job sites, and factory workers on the line all adopted the same fabric for the same reason the railroad did. It worked. The stripe wasn't a style choice, it was a functional answer to a shared problem, and it traveled from trade to trade because the problem was universal.
By the mid-20th century, Hickory Denim had become visual shorthand for honest, physical labor, regardless of which trade was wearing it. Its reach even extended to childhood, as workwear brands began producing miniature versions of the same overalls for kids growing up on farms and around job sites, often to match what their parents already wore.
A Fabric That Improves With Age
Unlike fabrics designed to look good on day one and fade from there, Hickory Denim was built to do the opposite. Its tightly woven construction offers real strength on the first wear, then softens gradually with time and use. Breaking in rather than breaking down. That's part of why, more than a century after it first showed up in a rail yard, the fabric hasn't lost relevance. It's the rare textile where age reads as character instead of wear and tear.
Carrying That Spirit Forward
The MILL Union Collection was built on that same idea, that the best materials are the ones that have already proven themselves somewhere else, under real conditions, doing real work. We paired Hickory Denim with a Duck Canvas Visor and a Double-D Ring Closure, drawing from the same working-class toolkit that put the fabric on the map in the first place.
This isn't a collection inspired by workwear. It's built from it.