Carolyn Bessette-Kennedy has always been idolized for her understated beauty that shone like a jewel while she was alive. Now with FX’s “Love Story” starring Sarah Pidgeon, we’re reliving the magic all over again. The J.Crew rollneck sweater, a revival of 1988 heritage fashion, has become a cultural phenomenon on Pidgeon after debuting it in episode 5 , as if borrowing it from her lover, JFK Jr. It is officially the most iconic knitwear moment since Meg Ryan’s fisherman sweater in “When Harry