Both men were technically breaking an age-old style rule: “Never wear black with brown.” But like other sartorial laws that have long since expired—like “no white after Labor Day” or “don’t mix gold and silver”—what was once a faux-pas has in recent years become a go-to move for well-dressed folks everywhere.
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The general thinking behind the rule was that two such powerful neutrals—black in all its slick, stark glory; brown with its earthy warmth—were too…

