Vintage Doncaster Blue Purple Abstract Dress SZ 14 Mod Art to wear Swing

Ok, so for the life of me I cannot find a date for this specific tag. My first instint was eighties doing forties, but the tag looks more like 1970s to me. If you know please do tell! What I do know is it is amazing! In excellent condition, the fabric (unknown... feels like a poly nylon blend?) is lightweight, the sleeves are sheer ish and the body of the dress is also a very light fabric, lined with black fabric that is polyester too I believe). There is a light puff to the sleeve and the sleeves end in elastic at the cuffs. My camera does saturate color a little, but this one really is very vivid. The contrast color is not pink though it is more of a purple/lilac. Made in the U.S.A. Marked a size 14 this is fairly accurate, but best to go by the numbers. I am 5'7", weigh 164 and wear a 36B cup and it fits perfectly on me. Bust measures 19 inches pit to pit lying flat, waist is 15 inches across no stretch, hips 23 inches across and length is 42 in front and 45 in back. The material tends to wrinkle fairly easily, I do roll garments carefully when I ship, but if it comes wrinkled a bit my apologies in advance!