Paradisio (1962)

An English professor interested in photography is given a pair of special sunglasses by an Austrian colleague. To his surprise and boyish delight, he discovers they're X-ray specs, which allow him to see through people's clothes! As he ventures across Europe, he is pursued by spies who're after the glasses. He eventually manages to elude them, and settles down to a life of ease, ogling naked women on beaches...