NEW YORK — Masculine-feminine and Eighties looks are everywhere for fall, so it stands to reason that pinstripes, the banker’s favorite, are also back in a big way. For some, however, they’ve never really been away. Ralph Lauren, for example, who’s been spending a little time with financial types recently, handles pinstripes with subtlety. He’s using them for everything from strong-shouldered dresses to long, soft bathrobe coats. Here, his wide-legged wool and cashmere pants and tight silk and spandex top with crystals. For more of fall’s New York stripes, see pages 4 and 5.