A conductor for the Paris Trolley Company, 1917
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A conductor for the Paris Trolley Company, 1917

In 1939, anticipating the German invasion of Paris in World War II, designer Coco Chanel closed up shop. "This is no time for fashion," she said. And, to put it delicately, she shacked up at the Ritz with her lover — a Nazi intelligence officer.

In World War I, however, Chanel was selling hats, and kept selling them throughout that war.

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The National WWI Museum and Memorial in Kansas City, Mo.