Vintage Black Tie Oleg Cassini heavily beaded evening gown sheer lower skirt outlet small size 8 more like a 6 worn gently

This simply gorgeous full length evening gown has a shorter top part ending about the knees that is very heavily beaded, with an illusion neckline. The beadwork is fabulous. There are a couple of loose strings and a few loose beads at the left outlet waistline. The lower part of the dress is sheer black, spreading out in fullness. The shell is made of silk and the lining is made of rayon. Beadwork at the neck and armholes too. Hidden zipper at the back with a hook at the top. Spot clean only, do not dry clean, made in China. The tag says size 8 but it measures and fits more like a 6. My mannequin is a size 4 for reference. Please see measurements.
shoulder to shoulder: 11"
armhole: 17"
armpit to armpit: 15"
bust: 32"
waist: 28"
hip: 34"
shoulder to waist: 16"
shoulder to end of overdress: 36"
waist to end of overdress: 20"
waist to bottom: 43"
bottom flare: 105"