This is a Ben Zuckerman ensemble, consisting of a sleeveless sheath-style dress, knee length and fitted. The matching jacket is double breasted with very large lapels and collar and decorative, vaguely military buttons.
This outfit dates from the late 1960's, and was Ben Zuckerman's interpretation of the Youthquake styles of that time. The dress length is shorter than Zuckerman's of previous years, making this outfit perfect for the older customer who wanted to be fashionable without exposing too much flesh.
Photos courtesy of Atomic Century.