For the new Grand Duke and his wife, the future Grand Duchess, Stéphanie de Lannoy, looking regal was vital. © WireImage According to fashion stylist Constance Richardson, the choice of dress is an especially poignant one for the Grand Duchess. The ascension to the throneOn Friday, 3 October, Grand Duke Henri of Luxembourg officially abdicated, allowing his son, the new Grand Duke Guillaume and his wife, Grand Duchess Stéphanie to take the throne. Before this date, it was used by Grand Duchess Charlotte for major occasions during her reign, and later by Grand Duke Jean for his swearing-in on 12 November 1964. On this occasion, the throne was restored and branded with the monogram of the future Grand Duke Guillaume.