Kate Middleton wore old dress to Trooping the Colour because....

Kate Middleton wore an old dress to attend Trooping the Colour in a top-secret return to royal duties amidst health concerns and her father-in-law King Charles' cancer treatment. Only a few people were kept in the loop about Kate's appearance and one of them was King Charles who was delighted that Kate would attend the royal event. Experts observed that both of them have come closer in their illnesses as this year Kate was placed next to the monarch.