Here we have a wonderful Ben Zuckerman cocktail outfit, consisting of a dress with a matching jacket. This ensemble would have usually been worn together, rather than as separates as we are used to today.
The outfits is made of very heavy velvet in a rich midnight blue. Ben Zuckerman never used flimsy materials, as he designed with the more mature woman in mind who needed substantial materials to flatter the figure. This outfit probably dated from the early 1960's.
Photos courtesy of Jonotang.