How do people dress up in school?

Since I’m going to the USA soon to do 12th grade, I’m just curious on how people dress, as much as I know the style in the US compared to Europe is very different right?

What I mean is here we dress the way we would dress up to go out to eat, cinema, etc.. But I’ve heard that people wear pajamas to school? Please anybody in hs or something tell me cause I don’t want to be the only one dressing differently thank you 😭😭