If you're a pagan you probably know what 'skyclad' means. There are plenty of groups out there in the real world who perform their rituals that way. 'Skyclad', for those who don't know, means 'naked'. You wear nothing but the sky.
A skyclad circle
Not all pagans go naked when doing rituals. Not all pagans do rituals. But there are also non-pagans who go naked when they can, simply because they like it. They're called nudists or naturists. There's always something wrong with each word, so many of them don't even bother calling themselves something. They just enjoy the freedom of being natural, either at home or in a natural environment.
Nudity in our 'modern' society is often frowned upon, because many of the monotheistic religions condemn nudity as being bad. The people who agree with that are all born fully dressed, I am certain. And then there's of course the porn industry that does its best to sexualise everything. Sadly they're doing a good job on that.
Being naked is not bad (it's actually healthy because it allows all of your skin to breathe). Taking someone who's naked as an easy prey for sex, rape or other kinds of abuse is bad.