Black is back! So is white, army green, and…plaid? Here’s our guide to the decade-hopping ­seasonal styles and the various ­baubles they’ll require. Every Federico Fellini film seems to come with its own clutch of female archetypes. The astringent wives with their high collars and glasses. The buxom and baring women. The couture-clad society ladies. The mods, mothers, ingenues, nuns. It’s never about one woman; there’s always a whole army of them vying for your attention from the opening scene to the end credits.In many ways, the fall 2013 collections felt like a Fellini film. Instead of the usual overriding era that takes hold of the runway zeitgeist—say, the ’70s or the ’30s by way of the ’70s—this season ping-ponged between the decades. We got a whiff of the ’40s from Carolina Herrera, Dsquared2, and Bottega Veneta, while the ’80s popped up everywhere from Al