I'm with pants and shorts depending on the weather. The few gals (around where I live in Los Angeles anyways) that I've seen in dresses, not so much skirts, usually are struggling while walking around. On the other hand mah last store manager at mah last job was a incredibly feminine person. Heck even ran around (literally) in high heels.
But it really depends XD' I'm sorry... It's just that. For example... for a tomboy girl I'd say pants or shorts. For an innocent looking girl I'd say dresses. And for a normal high school girl I'd say skirts. Things like that XD