The mum-of-three accessorised her outfit with a matching Juliette Botterill hat and pearl earrings that once belonged to Princess Diana, finishing off the look with nude suede pumps by Gianvito Rossi and a clutch by Loeffler Randall.
Kate was accompanied by husband Prince William, who looked suitably dapper in a light-weight tuxedo and top hat.
It is estimated that there were approximately 8000 in attendance at this particular garden party. The Queen holds several at Buckingham Palace and her Scottish estate, Holyroodhouse, throughout the year
You might also like: