This year on the red carpet: Sienna Miller, Blake Lively, Rihanna, Lily James

Sienna Miller proved a stunning dress needn’t be splashy at the Cannes screening of La Glace et Le Ciel in May. 

With its leather top and pleated skirt, this Gucci dress united two of Spring/Summer 2015’s biggest trends.

Blake Lively’s first red-carpet outing for The Age of Adaline was in New York in April. She set the tone for a particularly glamorous press tour in this leather and lace Monique Lhuillier gown. Notwithstanding the koi fish-shaped clutch, this is my favourite look of 2015.