The dress code. I liked your analogy, but dress codes are specifically made for women. School official's don't care what men wear, but if a girl is wearing shorts without the connotation of feeling sexy, more to have relief from heat (which shorts are almost impossible to find long, even just not booty shorts), they get sent home. They're definitely an inequality when it comes to clothing for men vs women. Women get thinner clothing, that's more revealing, when men get thicker, more durable clothing, that covers most the body.