Alex Jennings (as Duke of Windsor): A linen two-piece suit...

PROPS, COSTUMES AND SET DECORATIONS FROM THE CROWN
Alex Jennings (as Duke of Windsor): A linen two-piece suit
Season 5, Episode 3, 'Mou Mou'
Custom-made white linen double-breasted suit jacket with peak lapel and two slit pockets, with handwritten production label reading D.O. Windsor S5, and a pair of turn-up trousers with silver side adjusters, with handwritten production label reading Duke of Windsor S5 (2)
This episode opens with a group of men playing football in Alexandria, Egypt, in 1946. The clamour of the players and the crowd is juxtaposed by the elegantly dressed Alex Jennings and Lia Williams (as the Duke of Windsor and Wallis Simpson) stepping out of a chauffeur-driven car in the city.

Please note that the shirt in the image is for illustration purposes only and is not sold with the suit.