Speaking stereotypically:
The reason there are classifications is because men normally pick plain clothes because most aren't concerned about fashion, or clothes that look cute. Most want to show their manliness. Because flowers are pretty, and typically girls like pretty things, some clothes are decorated in them. Since girls like these things, for a guy to wear a skirt with flowers on it, would be showing he's more feminine. Most men typically, even if they understand it's ok to be feminine, like to assert their masculinity.
It's all because of stereotypes. Stereotypes are real even though everyone likes to deny them.
It's nice being able to express yourself with clothes. I'm glad that I can show my more feminine side by putting on a skirt. I would do it either way, because they are cute, and comfy

~Alyssa~