“It” is that hard-to-define, but know it when you see it, quality that makes a woman irresistible. Clara Bow, 1930s-era Hollywood ingénue, was the original It Girl.  L’Oreal Professionnel’s Fall/Winter 2013-2014 collection, “IT Looks” features three major seasonal hair color and style trends created for three of today’s newest it girls by Odile Gilbert.