The trench coat's defining features were designed for soldiers, not for style. Every classic element of the garment—the storm flap, the D-rings, the raglan sleeves—exists because of a specific problem in the mud and rain of World War I. I find that this is the detail most histories gloss over: the coat we treat as a symbol of elegance is, functionally, a piece of military engineering that simply outlived its war.
The garment took the shape we recognize today during the First World War, as Smithsonian Magazine's history of the coat explains—though it was not invented for that war, and no single brand can claim sole credit for creating it. Both Burberry and Aquascutum were leading manufacturers, and both were commissioned by the British War Office to outfit officers. The war codified the design; it did not conjure it from nothing. To understand why the coat looks the way it does, you need to trace it back another century.
19th Century Origins: The Birth of Waterproof Fabrics
The story begins not with a coat but with a fabric problem. As early as 1823, rubberized cotton was being used in weatherproof outerwear for both civilian and military use. These garments, nicknamed "macks" after their inventor, the Scottish chemist Charles Macintosh, were brilliant at keeping rain out—and equally good at trapping sweat in. They carried a distinctive, unpleasant odor, and, as Smithsonian's account notes, they had an unfortunate propensity to melt in the sun. The Shirt Company's history adds Thomas Hancock, founder of the British rubber industry, as Macintosh's collaborator in these early waterproof coats of the 1820s.
Imperfect as they were, the macks created a market and demonstrated a need: clothiers kept working toward waterproof textiles that could breathe. Later in the 19th century, London clothier John Emary patented a superior water-resistant fabric and renamed his company Aquascutum, from the Latin for "water" and "shield." By the mid-19th century, as Gloverall's history of the coat describes, new tightly woven cottons emerged—tough, breathable, and water-resistant. That fabric development laid the foundation for the classic trench silhouette. The fashion icon of the twentieth century was, in truth, the answer to a nineteenth-century chemistry problem.
World War I: Codification as Military Gear
When war broke out in 1914, the British officer faced a wardrobe crisis. The bulky wool greatcoats of earlier campaigns were too heavy and too immobile for the conditions of trench warfare—unpredictable weather, deep mud, and the need to move quickly. Officers required something lighter, more mobile, and better suited to rain, as Gloverall's account puts it. The War Office turned to established clothiers, commissioning both Burberry and Aquascutum to design and produce coats for officers.
What emerged was a genuinely new kind of garment: long enough to protect the wearer from rain and mud, but short enough for ease of movement, and full of practical design features. According to Gloverall's description of the coat, "everything had a purpose; nothing was purely decorative." This is the coat's essential character. The war did not invent waterproof outerwear, but it forced the design into a specific, enduring form—the form that, more than a century later, still reads as current. The name itself comes from where it was worn: the trenches.
