I think they're skirts.
skirts and dresses
Girls used to wear petticoats
Skirts and dresses
Yes
They're not allowed, but lots of girls wear shorts under their skirts.
It can be volley ball, and tennis
girls grass skirts boys sometimes grass skirts on special occasions.
girls wear long skirts and long shirts
Really really preppy clothes
Not really. Most people wear skirts that are short. In the UK, most girls in schools now wear trousers.
Some girls might think its cute. Or they worry they might show too much skin.
No. Where did you get that idea it isn't very smart.