These are Anpanman long pants. The stomach area is extended like a belly band. The fabric is a versatile thickness that can be used in seasons other than mid-summer and mid-winter. They can be worn as everyday clothes or pajamas. The Anpanman on the rear is cute. They can be used by both boys and girls. I can't find the size tag, perhaps it was cut off... I'm listing them as 95cm as they were used around that size.