That’s almost the same size as Kate Moss at the height of her career — the differences being that, at 5ft 10in, the Duchess is three inches taller than the supermodel, while her waist is half an inch smaller. ‘With those measurements and her height, Kate definitely could be a model,’ says Carole. Lingerie expert Keeley Toomey of Figleaves.com estimates the Duchess is even smaller, just a 30A bra size and a dress size six. It wasn’t always like this. In the earliest days of her relationship with William, Kate was a comfortable size 10 to 12 and always looked fantastic and fit, being a naturally sporty girl. It was understandable, of course, that she would want to drop a dress size in the build-up to her wedding day.