However, she does have a strong interest in clothes, as long as they're the right kind. Her new collection for British outdoor clothing brand Musto is devoted to equestrian clothes, designed by Zara to be technically suited for efficient and comfortable riding. On the back of each garment is stitched 'ZP 176', her international riding number.
'I've been wearing Musto since I was little,' she says, which is hardly surprising since the Queen and the Duke of Edinburgh also sport the label. 'I wanted to design clothes that would keep me warm, and that are waterproof and windproof, while getting things right, like the length of the jackets, and putting a seam in the sleeve so you can bend your arm. I want them to have a better fit while you're riding, give a better silhouette when you're off the horse and not ride up when you're jumping. But I like shoes and dresses as well. All girls do! The Louboutins are beautiful, aren't they?' she says, not seeking reassurance but deploying charm by asking my inexpert opinion. 'Being brought up in a family like mine, you have to dress formally more often than you might otherwise.'