Watch 24 Hour Catwalk series free. Hosted by television personality Alexa Chung, each episode of 24 Hour Catwalk gives four talented designers the chance to compete to create their own collection... in just one day. After a first cut challenge and elimination that will test their innovation and aesthetic, the competition whittles down to two, each tasked with creating a themed collection for their own star-studded runway show. Contestants will be on pins and needles when they, along with help of 24 Hour Catwalks talented and opinionated sewing team, must prepare to showcase their three-piece collection to the program