This is a long-sleeved white shirt from Uniqlo. The size is M. It's 100% cotton and has a button-down collar. I bought it several years ago and have worn it multiple times, so it shows signs of wear. Also, there is a small black stain in one area (see photo 3). It has wrinkles because it hasn't been ironed. UNIQLO / Model: Broad Shirt Color: White UNIQLO / Material: Broadcloth Pattern: Solid Collar Design: Button-down (BD)