Men who live by the sea, where a coastal day can be surprisingly cool, should feel comfortable donning a Shetland tweed jacket out of season when the temperature calls for it. Indeed, there is ample precedent in old illustrations from Apparel Arts and Esquire for Shetland wearing among the summer cottages of the American elite and there is certainly no shortage of appropriately cool days in the northern latitudes. Shetland, of course, is the lighter tweed, available in weights between 10 and 14 ounces (300 to 400 grams).
Sunny day Shetlands work nicely with cream colored trousers from either hard to find lightweight worsted flannel or the more widely available mid-weight gabardine. Add spectator shoes and a scarf like those worn by the gent in the illustration for his tour around the deck.
The tweed cap is optional.