This is a vest tunic from Shimamura's juo line (^^) I enjoyed wearing it in the summer with camisoles or T-shirts, and in the spring and fall layered over long-sleeved T-shirts. The back of the neck has a snap button, and the armpits can be fully opened with ribbons, so it can be worn for a long time. I bought it when my child was size 70, and they wore it until they were almost size 90. My child is a bit chubby, so if your child is slim, they might be able to wear a size 90.