By Jessica Gibb & Joseph Wilkes A defiant Prince Harry may have sent his “archnemesis” brother Prince Williamand estranged father King Charles a hidden message with this choice of attire on Wednesday night, a royal expert has claimed. The Duke of Sussex was seen wearing his KCVO Neck Order and Star at a recent event at St Paul’s Cathedral, which some are saying is a firm message to his father, King Charles, and his brother, Prince William. At this event marking the 10th anniversary of the Invictus Games, the Duke of Sussex used his attire to pay homage to his period as a senior working Royal d…