I'll go with the very late 60s' date on this.... My former SIL used to make most of her own clothing, and she made a dress very much like this ca. 1968-69--I remember it only because she wore it to some family function and it didn't fit her quite right, and there were some snide comments made about it! The ruffled skirt was popular in the 70s, but the neckline, shape of the bodice, and high waist look slightly more late 60-ish to me.... Could be early 70s, but I'd lean earlier.