St. John Single Neckline Button Swing Jacket made in the USA.  I believe 1980's based on the shoulder pads.  

Women's size 12

Wool / Cotton blend with Decorative Gold Buttons

Appears to be minimally worn, possibly unworn as there is a sticker still on the inside.  a couple of very small snags from storage at one cuff.  See pics.

Actual measurements:

Armpit to armpit approx 21" 

Shoulder seam to shoulder seam approx 16. 5"

Across the hip area approx 21. 5"

Sleeve length from shoulder seam to cuff approx 20. 5" 

Length down the back approx 21" 

Mannequin measures approx 35" Bust 27" Waist 36" Hips

This item is sold from a vintage boutique in Buxton, ME.