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Every roundup of classic sunglasses trends tells you one thing: Invest in a pair of aviators. Like menswear trends spanning from trench coats to chinos, its origins go back to the military, developed in the early decades of the 20th century to protect pilots’ eyes against frigid temperatures in an exposed cockpit environment. Civilian use transformed them first into a technical sporty pair designed to block out the sun and reduce glare more effectively than what was available on the market at the time. And, as we’ve seen, their shape and composition evolved with style trends toward the end of the 20th century, becoming flatter, featuring gradient tints, and, into the 21st century, incorporating coloured acetate frames for variety.