Christian Dior Vintage intimates Slip black dress underwire bra top lingerie

Description

Christian Dior Vintage black lace top Slip dress with underwire bra.
Dior brand name sewn on bust at center - Dior brand lingerie tag inside
No size tag!  No fabric content tag.  Assumed polyester.  Straps adjust.
Please use measurements
13 inch bust lying flat
13-16 inch waist - some stretch, not much
A or B? Cup?
40 inches long
Vintage, used, rare item.   No returns. Final sale.