It's size 90, but I wore it when I was in kindergarten too. The sleeves might be a little short though. When I wore my kindergarten backpack, I would unbutton the back and spread it out, and then put it on over the backpack. Before this type, I wore a poncho type that didn't have sleeves, but the length was short and I was worried about getting wet, so I switched to a type with sleeves. It has a water-repellent effect, but since it's not new, you might want to apply a waterproof spray once.