Kate Middleton's 'Duchess Effect' Is Making Brands Boatloads Of Money

AP

When Kate Middleton wears a brand, it quickly sells out.

The fashion phenomenon has been dubbed, "The Duchess Effect."

While Middleton is also a fan of high-fashion favorites like Burberry and Stella McCartney, much of her wardrobe is purchased on High Street.

From Zara to J Brand, see the labels that she's boosting sales for.