This is a navy cardigan from Petit Bateau, made with a cotton blend. The size is indicated as 74, which I believe is equivalent to a Japanese size 70-80. The lining has a polka dot pattern. It can be worn by both boys and girls. The material is a soft, gauze-like fabric that feels good against the skin. I think it's a material that can be worn for a long time, from early autumn to late spring. There is some wear and tear, but I think there are no major stains or damage. Instant purchase is okay!