serica

Serge descends from Old French serge, which derives from Vulgar Latin sarica or serica, ultimately from Latin serica (vestis), meaning 'silken (garment),' from Sericus, 'of the Seres.' The Seres were the Latin name for the people of the Far East — specifically the Chinese — from whom silk reached the Western world via the overland trade routes that would later be called the Silk Road. The word serica was the Roman name for silk fabric, and it is the root of the modern English word 'sericulture,' meaning silk cultivation. But serge itself has not been a silk fabric for many centuries, and the disconnect between its name and its fiber is one of the most dramatic in textile history. At some point during the medieval period, the name transferred from silk cloth to a type of twill-woven woolen or worsted fabric with a distinctive diagonal rib on both sides, a fiber substitution so complete that a word meaning 'Chinese silk' now names a Welsh or Yorkshire wool.

The transfer from silk to wool likely occurred through the intermediate stage of mixed-fiber textiles that were common in medieval weaving workshops. Medieval weavers frequently combined silk and wool in single fabrics, and a serge that began as a silk-and-wool blend could, as the silk component diminished over generations and the wool component increased, retain its commercial name while losing its original fiber entirely. By the time English borrowed serge from French in the fourteenth century, the word already designated a durable, medium-weight twill-woven fabric made entirely of wool or worsted yarn with no silk content whatsoever. The twill weave — in which the weft passes over two or more warp threads before going under one, creating a diagonal rib — gave serge its characteristic appearance: a surface of fine, regular diagonal lines, smooth to the touch, resistant to wrinkling, and capable of holding a sharp crease. It was a fabric of substance and seriousness, the cloth of uniforms, professional suits, and institutional dress.

Serge's association with military and institutional uniforms dates to at least the seventeenth century and became firmly established in the nineteenth, when armies across Europe and North America adopted serge for their standard-issue garments because of its durability and practical qualities. British Army serge, dyed khaki after the hard lessons of the Boer War, became the iconic fabric of twentieth-century warfare — millions of uniforms, millions of yards of serge, clothing soldiers from the trenches of the Somme to the beaches of Normandy to the deserts of North Africa. The fabric's durability, its resistance to wind and moderate rain, its ability to hold a pressed crease even under field conditions, and its relative comfort against the skin made it ideal for military use. French serge de Nimes — serge produced in the city of Nimes in southern France — would, through a remarkable process of phonetic compression over the centuries, give English the word 'denim,' making serge the unlikely etymological grandfather of the world's most ubiquitous fabric.

In civilian dress, serge became the fabric of professional seriousness and institutional respectability throughout the nineteenth and twentieth centuries. Serge suits were the uniform of lawyers, bankers, civil servants, and schoolteachers — the material that communicated reliability, sobriety, and the kind of professional competence that valued substance over flash. Navy serge and charcoal serge were the default fabrics of male professional attire, so ubiquitous that specifying the material was almost unnecessary. The word itself came to carry these associations: to be 'in serge' was to be in professional uniform, dressed for business rather than pleasure, for duty rather than leisure. Today, serge has been largely displaced by lighter worsted fabrics and synthetic blends in most suiting applications, but the word survives in textile terminology and in the cultural memory of a time when what a man wore to work was, almost invariably, serge — and when that word still carried, unknown to its wearers, the ghost of Chinese silk.