My daughter's HS is fairly strict. It's Catholic HS.
They have a pretty strict dress code. Boys wear slacks or shorts, no jeans, no basketball type shorts and collared shirts. Girls can wear slacks, skirts, and dresses. They can wear blouses and nice t-shirts, but don't necessarily have to be collared. They wear jackets, or the HS named sweatshirt for their school or college sweatshirts (no other kinds). No plastic flip flops, but girls can wear sandals. Rules are enforced. But,most of the time, if you are wearing a sweatshirt, teachers wouldn't check to see if the shirt was appropriate. They also have a dressier dress code for days that there is mass.
Electronics wise, no cell phones during the day.
Rules are still enforced, even now.
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Julia