FALL IS ON THE HORIZON, which means we’re ready to embrace a new season of great fashion and must-have accessories. Style comes easy for our cover star, Gwen Stefani, who shines in the metallics of the moment and opens up about family, fashion, and finding love again (page 144). Fresh neutrals make for a chic wardrobe reset (page 156), while luxe brocade works for any occasion (page 130). We’ve also rounded up the top 10 bags, boots, and shoes for the months ahead (page 100). Elsewhere, we quizzed Valentino designers Pierpaolo Piccioli and Maria Grazia Chiuri on how much they truly know about each other (page 140). Speaking of dynamic duos, photographer Philip-Lorca diCorcia and Sigourney Weaver, who collaborated for Harper’s Bazaar 20 years ago, got together for a supernatural…