In Boston, scarves usually stir up images of knee-high snow drifts and schlepping through the midwinter slush, or the contrived and so-over-it Burberry wool number seen all over town for years. But scarves in lightweight, breathable cotton blends have taken on the role of warm-weather accessory, replacing necklaces as the go-to for adding color to simple ensembles. The long, flowing fabric of summer scarves give an air of effortless chic — and some extra sun protection to boot. Local shops where you can get wrapped up include Urban Outfitters (361 Newbury Street, Boston, 617.236.0088), the Gap (various locations), and Habit (703 East Broadway, South Boston, 617.269.1998).