'You've got to be data-driven': the fashion forecasters using AI to predict the next trend

It's Paris fashion week and the streets of the city are filled with celebrities, designers, models and journalists. Among the crowds, eagle-eyed experts are taking careful notes. These are the fashion industry's trend forecasters. Their job is to get a sense of the colours, cuts, fabrics and patterns in the designers' new collections, in the hope of detecting emerging trends. Their notes will quickly be added to curated "trend forecasts", which will be sold to designers and high street retailers, who will use them to inspire new pieces and decide what to stock next season – think of the "blue sweater" speech in The Devil Wears Prada, where Meryl Streep's character scathingly explains this process to her naive assistant Andy (played by Anne Hathaway).