I am not sure if its late 1960s but it looks like it is... Is it really Ungaro? If so, that is an early Ungaro. I think he only started in c. 1966.
The back has an 18 inch long invisible zipper. The dress is simple, but lovely - I think it is a silk crepe(??) and I know it is lined with silk. Here is the label: Sue
Well DUH!!! Would have helped if I checked the Labels Resource before asking this! According to it, this is Ungaro's secondary 90s label. I was so sure it was late 60s! Sue