Vintage WWII American Red Cross winter (dark gray) service hat with the enamel pin. There is no size tag but it measures about a size 21 1/2 (it could maybe stretch to a 22, but it would be tight).
The hat is in fairly good condition; wearable, but it does have minor issues. There are a few tiny holes. On the underside of the brim, there is a hole. Light staining (not too noticeable) on the back of the hat. Some wear on the sweatband.