A Ralph Lauren polo shirt. A varsity jacket. Khakis and loafers. Are these clothes business casual? Date evening attire? Is this a “preppy” look? As it happens, the remedy is form of all of the above, and it’s since they share a common trend ancestor: Ivy. Based mostly on mid-century clothing worn on Ivy League campuses, Ivy is a vogue development that’s stood the exam of time. In her podcast, “Content articles of Interest: American Ivy,” journalist Avery Trufelman traces the globetrotting record of the Ivy fashion, from its roots at Princeton College to its modern day iterations by brand names like Uniqlo. Trufelman spoke with “Marketplace” host Kai Ryssdal…