Madewell Stripe Canby Button Mockneck Sweater in Stripe

A mockneck when buttoned up or a foldover collar when left undone, this striped pullover sweater can do double duty. Subtly stitched in a cotton blend, it's a casual layer we love.   Classic fit. Body length from high point of shoulder: 21 1/2" (based on size M). Cotton/polyester. great condition except for discoloration beneath mockneck as noted. perhaps can be corrected? size medium sold out online