A fortnight ago to the day, Clothes on Film creator and editor Christopher Laverty joined fashion historian Amber Jane Butchart to give one of two talks and a Q&A chat at The British Library in London. The subjects under discussion were, respectively, the unexpectedly colourful clothing of Prohibition era gangsters as portrayed in the HBO television series Boardwalk Empire, and the influence of movies and movie star style on fashion during The Jazz Age. After Christopher and Amber finished their talks to a delighted audience (they clapped), everyone reconvened to the elegant backdrop of the main library grounds to swig cocktails and dance the night away to Alex Mendham &…