Evening sheath dress in black poult de soie

Evening sheath dress in black silk poult-de-soie; mid-calf length; high round neckline plunging to deeper rounding at back; sleeveless; three back slashes from bust to waist; straight skirt; proper left slit knee to hem; proper left side zipper; unlined. Label: Grès / 1 Rue de la Paix / Paris. Worn by Anita Loos.