This is a Ben Zuckerman cocktail outfit in brown silk brocade. Made up of a belted, short sleeved dress and a bolero-length jacket trimmed in fur, possibly beaver.
Brocade was extremely popular in the 1950's and 60's. It was used extensively in formal wear and would elevated a simple suit into something suitable for evening.
This outfit was sold at the Tribout Shop, Wanamaker's. Wanamaker's was Philadelphia's first department store. It was an amazing store- full of interesting features like an Egyptian and Greek Hall, and floor dedicated to a pipe organ, a toy store that had a mono rail for children to ride and in house doctors and nurses. The Tribout shop was the department that sold high end ladies clothing.
Photos courtesy of Philadelphia Museum of Art.