Vintage St. John by Marie Gray Knit Basic Black Dress 

Short Puff Sleeves with open slit 
black satin trim on sleeve
back hem slit
fitted sheath dress
scoop neck

size small, fits dress form is 33-23-34 you can add and inch or two for smoother fit
measurement taken across front while flat

underarm to underarm ~ 15-17"
waist ~ 12-14"
hips ~ 19-21"
length ~ 44"

excellent condition!