While celebrating the 100th anniversary of the Royal Air Force at Westminster Abbey in London, Meghan donned a simple black Dior dress that featured three-quarter sleeves, a nipped-in waistline, thin belt, full skirt, and, once again, a bateau neckline. She paired it with beige pumps, a black box clutch, a swirling netted headpiece, and white gold diamond earrings by Cartier.