Prior to the 19th century, production capabilities were limited, which meant that things like military headgear, which were issued to thousands of troops, often had to serve both practical and decorative purposes. The tricorn, or tricorne, hat is probably the most famous example of this sort of double-duty chapeau. Worn during the 18th century, these triangular-shaped hats had large brims pinned up on either side of the head, as well as one in the back, directing rainfall away from the face and over the wearer’s shoulders. Since civilians also wore tricorn hats, most militaries applied an identifying cockade, or national crest, on the front. As in many eras, the French became military headgear trendsetters, creating highly embellished tricorn styles featuring elaborate designs in gold, lace, and fur.

The most common hat style of the American Civil War, the forage cap or kepi, was also adopted from the French. Kepis were made with flat-topped cylindrical crowns, and typically fashioned from dark wool with a black leather visor and chinstrap. Navy-blue Union caps were often decorated with a crossed sword or golden bugle emblem, as well as the individual owner’s regiment number. Confederate kepis only differed in their color, which varied from grey to yellow to red. Officer “slouch hats” were another familiar style during the Civil War, and were crafted with a wide circular brim which was lined with braided gold cord and sometimes attached to the crown on one side.

Shortly thereafter, the beret was made popular by the French Chasseurs Alpins, or Alpine mountain troops. This group initiated the association of berets with elite military units, though the hats were originally chosen for their versatility in inclement, high-altitude weather. Indeed, the Chasseurs Alpins wore berets because they provided a water-resistant, cold-weather head covering that was also light and easy to pack.

Military hats and caps of the 20th century generally fall into two categories: utility pieces, worn during combat or when working, and dress caps, which are part of a soldier’s formal uniform. Utility gear serves a functional purpose, protecting the wearer from harsh outdoor environments, while formal headpieces are essentially ornaments for the rest of a ceremonial outfit. Though troops might be issued many utility items for specific situations, soldier’s dress caps, featuring division, rank, and award insignia, were often better preserved since they were used less frequently.

A very popular headpiece among collectors is the peaked visor cap worn by members of the Third Reich military, which evolved from a similar style worn by German officers during World War I. These hats were issued as part of Germany’s formal dress uniforms, with each branch of the military identified by its own unique color and insignia combination. Typical designs, like the gray-and-navy medical officer caps, were decorated with an eagle carrying a swastika above an aluminum cockade, wreath, and braided chinstrap. Other German hats like the Waffen SS general caps featured a metal skull emblem. Japanese dress caps from World War II are similar in design to their German counterparts, but were made from khaki wool with red bands and piping, as well as a brass star symbol in front.

For American forces, dress caps came in a similar peaked-visor form, with white for navy troops, olive for members of the army, and blue for air forces. Specialized utility headgear became commonplace for the American military during World War II, most of which were made from light cotton or canvas, occasionally with patches to denote the branch or unit division. The most recognized hat of this style is possibly the white naval cap with its rounded crown and upturned brim, which was first adopted more than 50 years earlier.

Other distinctive caps from World War II include the Belgian enlisted corps’ side caps, made from khaki wool with a single tassel and central peak, designed to fold flat when not...

During the Vietnam War, American troops were issued generic utility hats with their fatigues, which resembled baseball caps made from olive-green cotton, as well as tropical “boonie” hats. These hot-weather hats were made with a fully-encircling brim to block sun, but were discontinued by 1971 because their floppy form didn't project the buttoned-down look that the military aspired to for its enlisted men. Vietnam also helped to establish the popularity of the Green Berets, a secretive Army Special Forces Unit, known as much for their deeds as their distinctively colored headgear.

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