When constructing a proper fall wardrobe, it's easy to become focused on the endless clothing and accessory options, but the key to creating a masterful outfit hinges upon your choice of outerwear. Your jackets, coats, and trenches are the cornerstone of any excellent autumnal look, so it is imperative to invest in the right pieces. Watch today's episode of Who What Wear TV for the details on this season's three essential outerwear shapes and for tips on wearing them, derived directly from our favorite celebrity trendsetters!

Photo of Lauren Conrad, INF Photo. Photos of Lou Doillon and Rumer Willis, Getty Images.