A girl shouldn't wear skirts if the occasion doesn't call for it. But it depends on how revealing the skirt is. But that skirt would be fine on most occassions. I think other than that if the skirt makes you look worse than it makes you look good, then people shouldn't wear them.
fat girls, if your thighs are rubbing together no one wants to see it. Just because some fat girls are comfortable enough to wear a skirt doesn't mean they should because it causes some of us to feel nauseous.