Kate Middleton’s sunny yellow dress has a bold keyhole cutout

Kate Middleton lit up the room as she attended the Oman State Banquet on October 20. Accompanied by her husband Prince William, the Princess of Wales wore a sunny yellow dress for the white tie evening at Windsor Castle.

Kate’s Elie Saab dress features a built-in cape and braiding at the neckline, as well as a bold keyhole cutout. She styled the pleated silhouette with the Queen Mary Lover’s Knot Tiara, one of her favorites. Worth an estimated $135 million, it was also frequently worn by Princess Diana.

Earlier in the day, Kate opted for an all-green ensemble in a nod to the flag of Oman. The princess reprized a Sarah Burton for Alexander McQueen coat dress – which she previously wore in 2022 and 2025 – as well as a Juliette Botterill fascinator.

Kate’s other accessories included a quilted Chanel handbag, a pair of Cassandra Goad earrings, and another heirloom piece that belonged to Diana: Queen Alexandra’s three-feather brooch. The diamond and emerald encrusted piece dates from 1863, with Tatler reporting that it was given to Princess Alexandra of Denmark on her marriage to King Edward VII.

The brooch depicts the ostrich feathers that make up the heraldic badge of the Prince of Wales and is surrounded by diamonds and emeralds. It was given to Diana when she married Charles, then Prince of Wales, and Kate received the brooch after becoming Princess of Wales in 2022.

The piece comes with an emerald drop, which Kate occasionally removes from the brooch when wearing it; Diana also removed or added the emerald to the brooch “depending on her outfit, wearing it either as a pendant or brooch.” Tatler reported.

Kate greeted Sultan Haitham bin Tarik with a bow, although she was not seen curtsying to her in-laws, King Charles and Queen Camilla, as is customary during welcome ceremonies for state visits. According to Peopleit’s probably because she already did it when greeting them earlier in the day.