As the year draws to a close, it's time to look back at some of the high-profile women who have shaped our buying decisions over the past 12 months. Global fashion search platform Lyst has named and ranked the most influential celebrities in fashion by monitoring spikes in demand and social media mentions generated by 50 global superstars during the course of 2018, by looking at search and sales response to some of their most talked-about outfits.