Ed McVey (as Prince William): A two-piece wool suit Season...

PROPS, COSTUMES AND SET DECORATIONS FROM THE CROWN
Ed McVey (as Prince William): A two-piece wool suit
Season 6, Episode 5, 'Willsmania'
Comprising a grey suit jacket with production label reading Will S6, and a pair of matching double vent trousers with turn-ups; together with a blue cotton slim-fitted shirt with double cuffs and standard collar by Hawes & Curtis, with production labels reading 5. William and Will S6, a navy tie with red and white square pattern, and pair of black leather loafers with tassels (5)
As seen in the Golden Wedding anniversary lunch and Royal Family photo scene.