The ship’s expected nude sailing – the trip is 70 percent booked – underscores the vitality of the U.S. nude tourism industry, which the American Association for Nude Recreation says brings in around $440 million a year, up about 10 percent in the last decade.

“I think when we vacation, we would rather travel with like-minded people, whether nudists or jazz music lovers,” said Nancy Tiemann, owner of the nude tourism company Bare Necessities, which is arranging the cruise. “It’s not just about getting on a cruise ship and taking your clothes off.”