A preview of the new  Princes s Diana exhibition in Kensington Palace  :

Princess Dianas fashion : The Bill Pashley Tweed Hunting Suit 1981
Memorably worn during an official photocall on her honeymoon at Balmoral, this brown tweed wool suit was actually one of two identical numbers commissioned by Diana.
The only difference was the size — and for her honeymoon Diana favoured the larger one as the extra shoulder room allowed her to take part in country activities such as shooting with her new husband.
The tweed fabric was very much in keeping with traditional English country dress. The suit is now owned by the Historic Royal Palaces charity, who bought it at auction