From fluted hems to long and flowing silhouettes, designers have been getting creative with skirts and dresses for the past few runway seasons. Think you've seen it all? There's a new feminine bottom on the high fashion runway that makes us think one more skirt style in our closet couldn't hurt; it's being called the double slit — or more specifically, the "M-slit." Once you get a glimpse of a few of our favorites, you'll understand where the name comes from (hint: it's the shape) and you'll also see why it's primed to become this spring and summer's street style star.