Especially when they end slightly above the knee and are somewhat form fitting. When I walk, it wants to ride up. Hello, you are short enough, I do not need to be showing any more leg. When I sit, it rides up even further forcing me to have to squeeze my knees together for my entire subway ride so the pervert sitting across from me doesn't catch a glimpse. Luckily, my thighs are big enough that I can let me knees sit pretty far apart and my thighs are still touching. Yes, lucky me.
Maybe I should stick to flowy dresses. Or Muumuus.