Vintage Lightweight Cos Cob Jacket Women's Coat

This is a jacket from Cos Cob. It is a light weight coat. The cuffs have a elastic end on them. The front has a zipper and a double button color along with a drawstring bottom. It has pockets on the side seams. IT is marked as size L and is about 23 inches long and 21 pit to pit. There is a 1/4 inch mark on the left chest, I am thinking it is a pen mark but may be just something in the fabric. There is remains of a tag on the collar. It is in great shape.