Absolutely unreal!
1900s button front robe or overdress in stunning black and white cut velvet.
Princess seams with low square neckline.
Closes with heavy marble buttons.
Pleated skirt back with slight train.
Good condition.
Lining was removed, some small bits remain.
Patch repair at right neckline.
Inside staining around shoulders and underarms, shows slightly on outside.
Wearable with care. 
Measurements:
Chest: 33.5"
Waist: 26"
Length: 56"
Arm length: 23.5"