I have no data to support my claim, only observation and experience. But I’ve noticed that people who like to walk around barefoot were open to nude recreation.
I once knew young woman who liked to walk around barefoot. She would walk around the mall barefoot or around town barefoot. She liked to skinny dip and hang around the house naked. She even played pool nude with her friends.
Every naturist I’ve met does not like to wear shoes. Does not liking to wear shoes mean you’re a budding naturist? Maybe not. But all the people I’ve met who were naturists first started out going barefoot.