Black silk dress by Romeo Gigli dated 1994. off the shoulder shawl collar with asymmetrical strap and short sleeves. Buttons down the front. High cut back slit, was most likely intended to be worn layered over pants. 

Size Labeled 42  - go by shoulder measurement for best fit 
Shoulder:  38" - 41" (measure where dress sits around arms) 
Bust: Full 50" plus 
Waist: undefined 
Hips: Full 50" plus 
Length: 45" 
Sleeve Length: 9.5" 

Condition: Excellent!