One of the world's more interesting dress occasions begins at the end of June this year. The Henley Royal Regatta is a rowing event held annually on the River Thames outside of London and it is the occasion for rowing club members to wear piped and/or awning striped striped blazers, like the one in the photo, in club colors.
While the event is open to the public, the more prestigious viewing locations have dress codes. The Stewards' Enclosure is the best known of these, and there men are required to wear a "lounge suit, blazer and flannels, or evening dress, and a tie". Unfortunately, it is also quite crowded and drinking is not permitted in the locations from which one can see racing. An invitation to the Remenham Club is a more flexible option.
Those men unable to attend can still dress in Henley style: white flannel trousers, a blue blazer worn with a necktie and a boater or a panama hat.