It was recently revealed that Kate uses hairnets to keep her up-dos in place Superdrug has revealed a 40 per cent increase in sales of the £1.09 product Comes after her royal tour hairdresser gave a glimpse of her hair regime Given the Duchess of Cambridge's enviable tour wardrobe for her recent trip to Sweden and Norway with Prince William, it's perhaps little wonder we've seen the return of the Kate effect.