Okay kiddo, a gymnosophist is a person who doesn't wear clothes, but not because they forgot to put them on or because they like to feel the breeze. They choose not to wear clothes because they believe it's important to feel free and be closer to nature.
Some people think it's weird or inappropriate to not wear clothes, but for gymnosophists, it's a way of life. They think that clothes are just something people invented a long time ago, and that it's not necessary to wear them all the time.
But don't worry, not everyone has to be a gymnosophist. It's just one way of living that some people choose if they feel it's right for them!