Two formal nights are standard on seven-night cruises and three to four nights, depending on the itinerary, on longer sailings. Men are required to wear tuxedos or dark suits after 6 PM. All other evenings are either informal, when a jacket is called for (a tie is optional, but most men wear them), or casual, when slacks with a jacket over an open-collar shirt for men and sporty dresses or skirts or pants with a sweater or blouse for women are suggested.
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