I'd not heard of the Naked Rambler until just now.
A few weeks ago, my wife and I were walking along the Greensand Way in Kent when we saw what we first thought was a naked hiker coming towards us. As he got closer, we could see he was wearing Speedos and boots, so definitely weird but not naked. I've just googled 'Naked Rambler' but I don't think it was the same person.