Vintage 
Beautiful!
DEFINTELY MORE SMALL THAN MEDIUM!!
Measurements are as follows:

At Waist, 13" across front
Under Armpit, 16" across front
Sleeve width, 3 1/2" wide
Across bottom, 17" across front

See through black at V Top
Hook and eye at neck and full length zipper, stops about 2" from the bottom of blouse

Scalloped at end of sleeve and at bottom of shirt