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Use "underdressing" in a sentence
"I'm a big fan of underdressing for big occasions and overdressing for smaller ones—that way, you at least look different from everyone else."
"There is indeed such a thing as overdressing, but that is when one ignores the conventions of the situation: the equivalent of ignoring the conventions by underdressing."
""The most basic mistake new employees make is underdressing," says Randall Hansen, a professor of business at Stetson University in Deland, Fla."