The size is F. I think it's a good size for those who usually wear size M. Please refrain from purchasing if you are nervous about used items. Returns are not possible, so please feel free to ask if you have any concerns. [Product Description] This is an adult casual work jacket with color-blocked collars and cuffs that create an accent. The gathered, fluffy silhouette is a cute point ◎ Double flap pockets are also convenient. The natural color balance makes it easy to coordinate and matches well with a clean style. Season: Spring, Autumn