Vintage maxi dress, navy clue, ley hole back, flutter sleeves, M

Vintage dress. Possibly from the 70s Dark blue/navy No tags of any kind (they were removed because of the look of the back), but mu=y estimate is that the dress is a medium. Photographed on size 6 mannequin, Please also see the approximate measurements. There is also some stretch Fitted upper Maxi One button closure in the back; the back is quite open all the way to the waist Flutter cap sleeves No tag as to what the fabric is, but my estimate is that it is a light jersey possibly Approximate measurements: pit to pit: 14 1/2-16 1/2"; across the waist: 13 - 16" Preowned, vintage in very good condition 2638