Bryan It sounds like the belts were mainly used for protection (from others) and most of the students (who wore belts) had full access to their keys?
yes the majority of girls,
Bryan Did those students wear them while at school or only when venturing off campus?
most of girls used it when they went out of the school. in schools only few girls used it usually and some girls had to use it some weeks if they were punished in their homes at weekend.
Bryan I assume this was an all-girls school?
yes
Bryan Other than yourself, how many students would you estimate wore belts to which they did not have easy access to their keys?
less girls in lower curses and more girls in high curses. some girls in lower curses had access to the keys but when they become older, their families they took away the key. Answering your question I think about 20-30 girls.