According to Bethan Holt, fashion news and features director at The Telegraph, the Duchess of Cambridge has two priorities when it comes to her wardrobe: to look great and to fly the flag for British fashion. And she does both, says Holt, whose first book, The Duchess of Cambridge: A Decade of Modern Royal Style, hit shelves this month. Now a decade into her reign as a style icon, Kate has boosted the British fashion industry by up to £1 billion (over $1.4 billion) in a single year and knows the power in fashion. “It’s a great tool that women have in their arsenal,” Holt says, “and they should use it.”