Even at 61, Jane Birkin is still a style icon.  The muse behind one of the most famous bags in the world (ever wonder how the Hermes Birkin bag got its name?) paired up with Lutz & Patmos, the luxury sweater and knitwear designers, to create a capsule collection of luxe sweaters.   “She has this really relaxed, nonchalant style without being overtly sexy, which is very sexy,” Lutz said to WWD. The line is set to unveil during New York Fashion Week next month but no word yet as to whether or not the media-shy guest designer will make an appearance.