My wife's favorite scarf from this season's acquisitions is one of Michael Drake's lightweight worsted "king's" cashmeres in a black and cream check for wear with casual outerwear - usually a shirt jacket.
Lightweight scarves provide the visual impact of their heavier relations without all of the warmth. And this is gossamer cloth that provides temperature control while remaining practical for moving between outdoors and in on errands without constantly disrobing.
There are to me two categories of scarves: silk for dressy occasions and cashmere or merino for for combating the cold. This stuff falls nicely in between.