Here are two episodes of the BBC Witness History audio show regarding naturism:
Germany's NudistsWitness History
https://www.bbc.co.uk/programmes/w3csv267An East German nudist recalls going naked beside the Baltic Sea in the 1950s, despite the disapproval of the country's communist authorities.
Britain's first nudist beachWitness History
https://www.bbc.co.uk/programmes/p00j84csIn August 1979 the seaside town of Brighton decided to open a nudist beach.
It was the first place in Britain to agree to allow naked bathing.
At first it was a very divisive idea, which shocked some of the locals.