If I had come across this outfit in my travels, I would have dated it to the mid-to-late 70s. It is my experience that these handkerchief hems and floaty capes are more Disco than Boho. But I would have been wrong, wrong, wrong. This full page ad for Nan Duskin that features the Pauline Trigere ensemble is from the spring of 1970. Still learning after all these years!
Here's a very similar ensemble by Trigere in the collection of the Met Museum. This one is dated 1971.
Full page ad for Nan Duskin from Vogue, 1970. Illustration by Duffy.