OUTER FIELD

One of the reasons this trend has staying power? It hits that functionand-form sweet spot. A lightweight windbreaker layered over everything pulls it all together in a flash. Undercover jacket, $905, from www.matchesfashion. com. Georgia Alice T-shirt, $310, and long-sleeved top, $369. Bottega Veneta pants, $1,150. Gucci shoes, $1,540.