Vintage cotton sateen Army shirt.  Can be worn as a shirt or is a good weight for an overshirt.  Decorated with Jolly Knot's personal colection of vintage patches from the Girl Scouts 1960s-1980s. 
 
Size:
Womens size 6 (Boyfriend overshirt fit)
37 Chest (boxy fit) and narrows at waist
28 Center back nape to hem
 
Fit is a small Womans size