Queen Camilla returned to her tried and true Anna Valentine designs for a garden party at Buckingham Palace on Tuesday in London.

The U.K.’s queen consort re-wore a black and white coatdress from the British designer, based in London. The long-sleeve frock featured a crisp white tone with accents of black along the sleeves, neckline and asymmetrical placket of the piece.

Queen Camilla, who attended Tuesday’s garden party alongside King Charles III, added a Philip Treacy black and white hat to further augment the color scheme of her attire. Other elements carried the classic color combination through.

Queen Camilla also wore a pair of Eliot Zed pumps in black leather and carried a Launer Bella clutch in Ebony black. The queen consort also wore a pair of leather white gloves to complete her ensemble.

When it came to accessories, Queen Camilla went the sentimental route, donning the Queen Mother’s palm leaf brooch. Previously part of the collection of Queen Elizabeth II’s mother, the Cartier diamond brooch was commissioned in 1938, per The Royal Watcher.

The brooch was comprised of several diamonds from the Queen Mother’s own personal collection. She wore the piece regularly throughout her life. Upon her mother’s death in 2002, Queen Elizabeth II inherited the brooch and wore the piece for several occasions during the latter years of her history-making reign.

The diamond brooch has since become part of Queen Camilla’s assortment of British royal family jewelry pieces, worn for several official royal engagements over the last few years — one of many the queen consort inherited from Queen Elizabeth II.

Tuesday’s garden party celebrated frontline workers from across the U.K. and recognized their dedication and contributions, as they serve their communities through volunteering, supporting charitable causes and working for emergency services.