I’ve done it 3 times.
I walked from Polo Beach (nude beach on Oahu) on the trail back to the road in just a thong and a back pack. I think I passed two people on the trail and a few cars passed when I walked along the road to my car.
I left Gunnison Beach (nude beach) walking the path from the beach back to the bathrooms in just a thong. As I was leaving several people were coming in. I think a few did a double take.
Lighthouse Beach at Robert Moses Park in NY used to be clothing optional. Since that ended a lot of people wear thongs and go topless. One of the days that I was there I walked down the beach and back. Passed by some other sunbathers, fishermen and families.