So? I don’t ever remember a boy wearing shorts to school. 1952-1964. No AC back then either! We survived just fine and loved looking at the girls in dresses.
I remember teen girls going to school with below the knee skirts held by a belt. Once at the school, they would go into the restroom and pull up the skirt above the knee, then folding the top down inside the belt.
I remember a few girls back in 1963-64 that still get my heart rate up after seeing them! Alas, they were under 16 and knew what they were doing to the boys!
I was in school in the 60’s. Boys wore shorts year round. But it gets pretty hot in Gitmo.