Help with prom dress?

[BeeswaxVintage]

Found this prom style dress and was wondering its age. Is it an 80s dress? Earlier? Later? Not a prom dress?

Any help is appreciated, thanks.

 

[Circa Vintage Clothing]

It could be an '80s prom dress, or it could be an '80s bridesmaid dress. In any case, it probably had a petticoat underneath.