Kate Middleton's favourite high-street store, Boden, has slashed the price of a 'slimming' wedding guest dress in a massive spring sale.The Duchess of Cambridge is known for her impeccable fashion sense, often opting for pieces from Alexander McQueen and Erdem, as well as high street favourites like M&S, Reiss and Boden. Boden has been a go-to for Kate for years, offering sustainable and high-quality garments at reasonable prices. While it's slightly pricier than Marks and Spencer or River Island, the retailer frequently holds sales that are worth waiting for.