Dry Day, on which New Yorkers were supposed to go shaveless, bathless and laundryless, will probably go down in history as 'Dirty Day' -- but not for these three cuties, Copacabana gals, who observed the water-saving ukase and at the same time stayed next to godliness. They are shown rub-a-dub-dubbing their undies, using the Central Park lake for a washtub, with soap and elbow grease combining with the ancient washboard to complete the job.