In HS, i wore Chinos, a white button down collar shirt, dark socks and cordovan shoes. When i got home, i changed to blue jeans and either a T shirt or a flannel shirt and sneakers.
When I was teaching, I wore .chinos, button down shirt, dark shoes.
The young men in HS, many of them, wore jeans, a flannel shirt of some sort, a baseball cap and unlaced workboots.