Should clothing have gender roles? Why or why not?

Clothing was created to cover your body. Now, it is a symbol of wealth and style. So why is it that men should not wear dresses and women should not wear boxers? Humans created the rules about what women and men should and should not wear, so technically; clothing is an opinion, right? I mean, back in the day, it was weird to think about a woman wearing pants, skirts above their knees, or to show their shoulders. But now? How may girls do you see walking outside with skirts to their ankles? In fact, most of the time they were shorts! So should clothing have gender roles? I don't really think they should. So long as your junk is kept in place, I'm happy. Opinions?