A gorgeous black silk satin evening coat by Ben Zuckerman.  I would date this coat to the mid 1950's. It has no other label besides the Zuckerman one, but it was no doubt purchased from a high end store.

The coat is fully lined in white satin, it has elbow length bell sleeves with cuffs. There are no buttons or other closures on the coat, it is a clutch coat that the wearer would hold closed with their hands- a true 50's style.