Which luxury fashion house collaborated with the French military during WWI to develop what would later become their iconic trench coat design?

During World War II and other major conflicts, numerous civilian companies pivoted to support military production through unprecedented collaborations. These partnerships not only helped win wars but also transformed these brands and their product development for decades to come. How well do you know these historic military-industrial collaborations that changed both warfare and consumer products?

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Burberry
Louis Vuitton
Chanel
Hermès