Laura Bush became the first 'first lady' to attend New York's Fashion Week yesterday, in an occasion that was greeted in some circles with the same sense of importance as when Christian Dior unveiled the 'New Look.'Celebrities may be commonplace during the 150 designer shows that will take place in the city during Fashion Week, but it took a sitting first lady in the front row of the tents at Bryant Park to make the fashion audience pay attention.The front row was uncommonly filled with top designers, including Tommy Hilfiger, Francesco Costa of Calvin Klein, Nicole Miller, Luca Orlandi, Esteban...