St. John Santana Knit Sequin Knit Long Sleeve Sheath Dress Black

St. John Santana Knit Sequin Knit Long Sleeve Sheath Dress Black size 4 Very good condition. One spot on back is missing a sequin. There may be more missing but that's the only one I could find. Hard to notice with black on black. No material tag. Zips in back Padded shoulders No size indicated on dress. Would guess around size 4-6. Please see measurements to be sure of fit 18" pit to pit 42" long