Which famous military product launch eventually revolutionized civilian retail by creating an entirely new clothing category that remains popular today?

Throughout history, military product innovations have transformed civilian retail markets in unexpected ways. From combat gear becoming fashion statements to military technology revolutionizing consumer products, the crossover between battlefield innovation and retail success stories is fascinating. This trivia question explores one of the most influential military product launches that changed civilian retail forever.

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The T-shirt, originally issued as undershirts to U.S. Navy sailors in 1913, became a retail phenomenon after WWII veterans continued wearing them as outerwear
The wristwatch, initially created for WWI officers to coordinate attacks, which transformed from pocket watches to wristwatches for civilian fashion
Ray-Ban Aviator sunglasses, designed for Air Force pilots in 1936, which became a civilian fashion staple after WWII
The trench coat, created for British officers in WWI to stay dry in trench warfare, later adopted by civilians as fashionable rainwear