This is a lovely Ben Zuckerman jacket, once part of a suit. It dates from the 1950's. It is made of grey wool, and it features a tiny waist, and an interesting collar that starts as lapels and becomes a bertha collar at the rear.
The jacket was sold at Rose Alkon, Detroit. This was a boutique that was located on The Avenue of Fashion in Detroit, an upscale fashion district full of higher end stores.
Photos courtesy of Farmhouse_Vintage.