Consider your height. If you are short, stick to a skirt that hits just above or below the knee. For taller ladies, any length will do so long as it doesn't go below your ankles . Length is everything! You can totally ruin the midi look if your skirt is just 2 inches too long or too short. Ideally, you want a midi to hit mid shin, where you leg begins to thin out. If a skirt hits at the thicker part of you leg, it will make you look stalky.