Vintage Cambridge Open Front Graduate Top Pleated Back Unisex Large Similar To G

Vintage Cambridge Open Front Graduate Top Pleated Back Unisex Large Similar To Graduation Robe Full disclosure, I have no idea what this is. Very thin material and Pleated back. Two front pockets. Reminds me of some sort of graduation robe but shorter? Might be good for a judge / graduate cosplay? Great condition, vintage, made in USA Unsure of fabric content Lay flat measurements Bust 24 Length 30