@RockyFlintstone
As I mentioned, I am in my 40s so what went on when I was young may well have changed since then, but to answer your questions based on my experience:
But then how, as a child, would you know that someone with 'bad' intentions may have been doing something wrong if you had come across them.
I guess I wouldn't have, but no more than any other child who comes across a dodgy scout leader/priest/teacher/sports teacher etc.
Like, my child has been taught that what's in your pants is private, that adults (outside of home) shouldn't be showing what is in their pants, and that no one should be looking at what is in their pants. I hope that this might go some way towards safeguarding them in that, if someone asked them to take their clothes off, or if someone got undressed in front of them, with sinister intentions, they would know it was 'wrong'. Obviously I can't guarantee that this would happen, I can only reduce risk.
I was a child of the late 70s/80s, so the PANTS thing wasn't really around. I don't know how old you are, but the only thing I can remember was Charlie who told us not to go off with strangers. That said, I still knew that adults shouldn't be asking to see or touch our bodies unless they were parents or medical professionals. But at the naturist club, it wasn't like people were looking at our bodies, so it almost didn't compute that it was the same thing with a non-naturist. I NEVER would have shown my body to anyone outside of the naturist environment, but I didn't at the time consider that I was showing it to people inside the community, because that's just how it was.
*If nakedness isn't an issue, how would a child know that an adult asking them to undress or being naked in front of them when they shouldnt be is wrong?
Like I said above, the two were completely separate. I would have been horrified at the idea of showing my body to anyone who wasn't a naturist (and I didn't 'show' it to people who were naturists, it was just the way we were, but not in a 'this is my naked body' way)
Do naturist children understand that most people don't get naked, I guess they do? Do they understand that someone being naked in front of them might be wrong? Even if it is someone from the naturist community?
For me, I knew that what we did was different to my other friends, which is why we didn't talk about it with them. But only in a 'other people don't understand and might think it's weird' way, not that there was something inherently wrong with the way we lived. No, I didn't think being naked in front of someone from the naturist community was wrong, because that's just what we did. In fact, they were the only people I knew it was ok to be naked in front of, because I knew they didn't judge. Does that make sense?