Vintage Blue Gown with Matching Lace Shawl

1970s vintage blue sleeveless gown with sweetheart neckline, A-length skirt that drapes to the ankles, and matching lace shawl. Very feminine, slimming, and sweet. Enjoy two possible looks with and without the shawl. Tagless, US size XS. Bust circumference of gown 29“, length of gown from armpit to hem 50“, length of gown straps 14“. Skirt contains some faint scuff-like marks that did not disappear with gentle washing, one at the front right side at hip height and two much smaller and hardly noticeable ones a bit lower on the skirt (please see last two pictures). Brand unknown.