Not really accidental, i puposely sit where i can see.
Got female fren like to wear short jean shorts, not the ass hugging ones, she like to wear the semi loose loose type.
Our fren group we like to study/eat/play games on the floor in hall, so we sit in a circle on the floor like most fren groups. Whenever she sit down to sit crossed leg, she open her legs, then because jean shorts loose can see her different colour panties on different days. I want to tell her but then I will miss all the view.