My daughter immediately wrapped herself up in this cozy top. I got it as a mid layer but I think it’s likely too thick and warm and she may only use it for skiing on really cold days <20F. That being said, she’s been wearing it as much as possible for daily activities. For reference, she’s a tall, lean 10yo - wears size 12 in most girls brands. We went with a Medium which is the same size as her ski kit and it was the right fit.