I Magnin vintage black silver sleeveless slip dress or negligee size large

Vintage I. Magnin negligée and or midi length slip dress. Black with silver thread. Lace trim. I suspect it is a nightgown but the material is substantial enough to wear as a slip dress. Tag is from the 1990 era. It is in excellent condition, even considering it’s age. Machine washable Measures 22” across bust and will stretch, and is 50” long. Designer, dead stock, rare, vintage, slinky, glam, minimal, San Francisco