Vintage 1990s St. John Knit Black Ribbed Mock Neck Short Sleeve Back Zip Blouse

Chic Vintage 1990s St. John Knit Black Ribbed Mock Neck Short Sleeve Back Zip Accent Blouse Size: No size tag. Would best fit Small or XS. The flat measurements equate to an XS I believe, but this piece is extremely stretchy knit and my mannequin is a small size 4. There’s only ONE AVAILABLE, but will list under both. See measurements below. Laying flat, measuring across, unstretched: Pit to Pit- 15.5” Waist- 14.5” Length- 22.5”