From JCrew: "Four-season Super 120s merino wool. Why so super? 120 is the measure of the yarn (the higher the number, the finer the yarn), and since 120 is one of the finest, our fabric boasts a silky-smooth finish and a refined drape. Peaked-lapel collar. Two-button closure. Flap welt pockets, interior lipstick pocket. Functional buttons at cuffs. Fully lined in stretch fabric. Hits at high hip. Import. Dry clean. Catalog/jcrew.com only."

Petite item 86560, Tall item 86561. Available in black, navy, hthr flannel (pictured), and warm sienna. As seen on Refinery29 here.