I've forgotten the official product name. I suppose the material would be classified as knit? I'm not really sure. It's thin and seems like it could be worn layered under a shirt. (This is just my personal impression, so please use it as a reference.) *Due to lighting, the color may appear different from the actual product. Also, the color of the product may slightly differ from the images depending on your computer or smartphone environment. Free Size Shoulder width 42, Sleeve length 57, Body width 44.5, Length 56.5 *Measured flat/amateur measurement. Please allow for some error. This is a used item, so please refrain from purchasing if you are sensitive to such things. ★Will be shipped in simple packaging. Cut and Sew, Rib Knit