Vintage 1970s Midnight Blue Satin Nightgown Maxi Dress w/ Rhinestone Buttons

Is it a nightgown? Or is it a dress? I guess that's for you to decide. Either way, I'd say it's definitely evening wear. Look at those buttons! They're so incredible my camera struggled to capture the depth of their awesomeness. Only one rhinestone is missing from one button. Otherwise, they're perfect! There are loops for a belt, but a belt is not included. Good vintage condition. No holes. Some discoloration near the bottom (pictured). Unlined, thick polyester. Lying flat, measures 52 inches top to bottom and 19.5 inches across the chest.