ABS by Allen Schwartz silk slip dress

Lovely silk slipdress (or nightgown) ABS by Allen Schwartz, size 10. Smoky pink with tiny black polka dots and black lace straps & trim. Darts in front. Ribbon bow at chest. Fit & flare style. Silk with a polyester lining. Note: needs dry cleaning, as I just noticed some faint spots on the chest (last photo). Body of the dress is approx 36" long (not including straps); approx 19" pit-to-pit; approx 20" across waist, and slightly flares from there. Can be worn as a nightgown, as well. Super cute. Maybe vintage?