Portrait of Mme Lina Cavalieri 1901 Giovanni Boldini (1842-1931)

The picture has something of this: people, military, wear, man, weapon, war, soldier, sword, lid, helmet, uniform, army, woman, veil, battle, costume, courage.
Perhaps it’s a painting of a woman in a black dress with a white and blue hat on her head and a black and white dress on her left hand.