Chevrolet Underground Catwalk 2011, Berlin Fashin Show On Subway Train

A fashion week is a fashion industry event, lasting approximately one week, which allows fashion designers, brands or "houses" to display their latest collections in runway shows and buyers to take a look at the latest trends. Most importantly, these events let the industry know what's "in" and what's "out" for the season. The most prominent fashion weeks are held in the four fashion capitals of the world: New York City, London, Milan, and Paris.