Midi skirts might form the backbone of many a wardrobe, but they don't get as much air-time as the more extreme hemlines—blink-and-you'll-miss-it minis or supersized maxis. Ahead of autumn, however, in this strange in-between period when you're subconsciously gearing up for autumn, in-between is actually bang on, with knee-length skirts emerging as the "new" length of interest.