NEW YORK — Burberry is forever — but that doesn’t have to mean clothes that are staid. Instead, the looks are moving in a direction that gets younger and quirkier each season. This fall, for example, Burberry London is doing riffs on the classics. Here, their patchwork wool A-line skirt, wool turtleneck and wool and cotton trenchcoat. For more on plaid, see pages 6 and 7.