Amazing Vintage Wing Sleeve Top

Late 70s early 80s? So flattering, perfect condition. The only flaw that I can find is 2 inches of frayed edge on the inside neck liner (see pic). So original, I’ve never seen another like it. Detail accents are polyester. There is no fabric tag, so not sure about the knit fabric, seems like a polyester linen blend. My pictures make it look a little bit yellow. It is a true cream white with no discoloration.