It has been suggested that the coat worn by the officer in this drawing may be the same as the one worn by a gentleman in the centre of a drawing by Saint-Aubin in the Bibliothèque Municipale, Rouen.1
That drawing is inscribed at the bottom 'Vitchoura
,' a word defined in the Nouvelle Larousse
as a 'masculine name of Slavic origin designating the fur-trimmed Polish overcoat worn by both men and women.'2
Although our officer's exotic attire corresponds with that of the central figure in The Vitchoura,
such atmospheric figure studies are not uncommon in Saint-Aubin's work, and this is most probably a separate study, unrelated to the Rouen composition.
1. Gabriel de Saint-Aubin 1724-1780, exhib.cat., New York, Frick Collection, 2008, pp. 212-213, no. 50, reproduced
2. Ibid., p. 212; Nouvelle Larousse, Paris 1898-1901, vol. VII, p. 165