NEW YORK (Reuters) – Hundreds of fashion designers are showing their fall and winter 2013 collections at New York Fashion Week, but not all of them are on the runway. The semi-annual event, which is followed by fashion weeks in London, Paris and Milan, includes up to 500 fashion shows around New York and attracts about 232,000 people, from buyers to foreign press and wealthy customers. Top name designers at Mercedes Benz Fashion Week, which runs at Manhattan's Lincoln Center through February 14, have been streaming their runway shows online for the past three or four years. …