The sidewalk surrounding Manhattan's Bryant Park is lined with posters promoting a new image of Lord & Taylor, the U.S.'s oldest department-store chain. In the pictures, members of some mythical extended suburban family smile as they frolic in their vintage Mercedes convertible or slide into a wooden canoe.
Despite their beauty, the photos and the inference that they epitomize American style seem jarringly anachronistic. At a time when fashion has become global thanks to the Internet and the access it provides to ideas, resources and products, American style is becoming increasingly difficult to define. At New York City's Fashion Week there...