Orange is having a bit of a fashion moment. Wherever you look, it seems likely you will spot that most zesty and fruity of all colours. It has been making its mark on New York Fashion Week catwalk, Herve Leger and Carolina Herrera have applied it to glossy evening wear, whilst J Crew shows why a brightly coloured coat is a must-have for grey days. On the red carpet, it is a smash hit. Abbie Cornish looked so beautiful in a tangerine Elie Saab number covered in embellishments, whilst Reese Witherspoon and Karlie Kloss have both shown how well this most citrus of colours adapts itself to bodycon and classic…