vintage unbranded silk long sleeved‎ blouse- black

EUC vintage black silk blouse. This has no brand tag or size tag. Only defect I can see is bunching at the sleeve as shown in photo. It buttons at the neck. Measurements: Armpit to armpit: 20 1/2” Shoulder to shoulder: 15 1/2” Shoulder to bottom: 27” Sleeve: 22”