USA Student Nurse, 1964. Love this pose - You can see her and the back of her cap and apron at the same time. It looks like she may have just received her Senior Student stripe, since new probationers getting their first cap, don't get one with a black stripe on it. New caps - in the US anyway - are almost exclusively plain white, unless pastel stripes are used to denote class level, but black only for Senior Students and/or Graduate Nurses, depending on the school.
