--Vintage 90s Sutton Studio for Bloomingdale's charcoal gray merino wool knit blazer/cardigan.
--No size tag--see measurements. Appears to fit approximately modern Medium.

Measurements (lying flat):
Bust (pit to pit): 18"
Shoulder to shoulder: 15.5"
Sleeve (shoulder seam to cuff): 25"
Length (back of neck to hem): 25"