Gap long-sleeved gingham check shirt Color: Blue Material: 100% cotton Not flannel. I think you can wear it in spring, summer, early autumn, or in rooms with heating in winter. Size: L ● Although the length is long, I think it has a slightly slim fit and design. ● The size and material tags have been cut off. ● When wearing it, I always wore a short-sleeved undershirt, so the fabric on the armpits did not directly touch the skin.