Documentary film-maker Pietra Brettkelly speaks to Rosie Herdman about her film Yellow is Forbidden, showing at this year’s New Zealand International Film Festival, and her experiences during her varied and colourful film-making career. Yellow is Forbidden follows Chinese designer Guo Pei – who burst onto the international scene in 2015 after Rihanna wore her canary-yellow gown to that year’s Met Gala - as she works to realise her dream of being accepted the ultra-exclusive Haute Couture commission of Paris.