Images of polo neck sweaters sitting under tweed jackets are flitting around my mind's eye. These pleasant images remind me that the polo neck is perhaps one of the most misunderstood of the sweater styles. If you wear them well, they can be winningly elegant or robustly rustic; But get a polo neck wrong and you can look like a mime artist or Steve Jobs (avoid black).
Obviously, the neck part serves as a scarf, so these styles are made for scarf-wearing season primarily. If you think you might not need to wear the 'scarf' all day, then make sure you're wearing something under the sweater should you need to take it off. And I don't mean just your vest. You don't want to be the talk of the tea rooms.
Let's set a benchmark on the roll-neck sweater straight away with this 8-ply Scottish-made cashmere wonder from Johnstons of Elgin. This would look so well under a green tweed jacket.