This is a Western long shirt from MM6 (エムエムシックス) MAISON MARGIELA (メゾンマルジェラ). It's a design and size that can be worn by anyone. With a shoulder width of 43cm, a body width of 52cm, a sleeve length of 61cm, a front length of 76cm, and a back length of 82cm, the long length is expected to have a style-enhancing effect. The material is 69% polyester, 29% rayon, and 2% polyurethane, making it a comfortable piece that combines lightness and elasticity. It's a simple yet sophisticated item with Margiela-like details, making it a main piece on its own. I bought it at a major brand shop.