This is a lovely Ben Zuckerman suit in grey wool. It dates from the late 1950's and was retailed at Bonwit Teller.
The jacket is single breasted with welt pockets at the waist. It also has decorative top stitching around the entire jacket edges.
The skirt has box pleats that make the skirt flare out from mid-thigh and make the skirt very easy to walk in.
Photos courtesy of Select Thrift.