This jacket is so gorgeous. The quality, make, fit and feel are exactly as you would expect from a Dior item. It is in excellent vintage condition. Love love love all of the amazing details from the double breasted, short jacket style to the large front pockets, and back pleat detail. I love the loose fit. Looks amazing with high-waisted pleated trousers or skirt. Easily dress this casually as well with some high-waisted skinny jeans or culottes. 

It's listed as an 8 or Medium. I would say this is very true to size. With that said if you enjoy the oversized look then I would call this a Small / Medium. I am a Small and would wear this as is. Love the dramatic shoulder pads. They are medium weight and I think adds loads of that 80s character that you want with this style. Made in the USA. Pure wool.

As usual please refer to the below measurements for most accurate fit.

Item Measurements: Laying Flat / Not Doubled / Not Stretched

Shoulder seam to shoulder seam width: 16.25 inches wide
Armpit seam to armpit seam width: 19 inches wide
Armpit hole length: 9 inches long
Sleeve length: 22 inches long
Hem width: 18.5 inches wide
Length of jacket from shoulder seam to hem: 20 inches long