Vintage Gunne Sax stunning cobalt blue/lace cottage core dress, like new!

What a find. Vibrant blue brocade like finish. Lace in front bib. Hidden back zipper, unlined. Marked 13/14. Pit to pit is approximately 18.5”, shoulder seam to ( dropped) waist is 19”, waist to hem is 29”. Immaculate condition. Most likely 70s or 80s vintage.