Gorgeous vintage 1970-1980s dress

Gorgeous vintage 1970-1980s dress (never worn, great condition, perfect for prom, formal gatherings, or anything!) - i got this from a pricey consignment store in my area… the dress was originally $300 but i got it for a good $250… i loved it so so so much, but ever since i bought it, it has just been sitting in my closet… hopefully a beautiful buyer can make use of this beautifully elegant piece! - waist = 29-32 inches - size 4/6 - length 57” - shoulder length 20”