Thank you for viewing! The size is a Japanese size 9. It's okay to wear it just as denim, or you can add an inner layer for a warm, fluffy feel, making it suitable even for mid-winter. You can wear it in spring and autumn when it's a bit chilly, except for summer. However, it's denim, so it has some weight to it. Length: 61cm Width: 52cm Sleeve Length: 61cm (53cm when folded) Color of the garment: Black Season: Spring Season: Spring, Autumn Season: Spring, Autumn, Winter Pattern/Design: Solid