As we look forward to fall, the focus is on fast, fabulous ways to reboot your wardrobe. Cue 15 instant updates that showcase the season’s key pieces (say hello to the cropped jean and slimmed-down shearling coats) and how to wear them (page 93). Next, strap on your Saint Laurent spiked-heel ankle boots, and get set to embrace classic black-and-white (page 100) and the prettiest pinks, as worn by our cover star, Natalie Portman (page 146). And in the spirit of the ’70s, indulge in the hippie era’s latest twist, with longer skirt lengths, opulent prints, and wine-colored accessories (page 138). Meanwhile, sleek menswear-inspired tailoring and hearty tweeds inject your look with a masculine edge (softened by ladylike ruffled blouses), and whimsical scarves—draped around the neck or tied to a…