Always a sartorially savvy investment, the puffer jacket - despite being reminiscent of a marshmallow and not *really* that flattering - reigns supreme as one of the most sought-after outwear pieces each and every winter. Sure, with each trip around the sun comes a bit of a reinvention (last year styles by Balenciaga, Acne and Alexander McQueen proved most popular; this year is all about Ganni's colour blocking and Arket's sustainability creds). But in some form or another, it's the winter coat style we obsess over.