Great and classic billowing top with sleeves that are not really perceptible due to the clam shell drape and design of the top. Great drape. Fantastic images of bright Peacocks.
Usually we want you to rely mostly on the bust measurement since sizes have changed over the years but this piece is marked “one size fits all” and that holds today as it did in the 1970’s. We would probably say One Size fit Most just to eliminate the extremes on both ends.