sacky,a.|ˈsækɪ| [f. sack n.4 + -y.] Of a garment: Hanging more or less loosely from the shoulders; not fitted to the waist. 1891C. T. C. James Rom. Rigmarole 51 A sacky frock-coat.1906Daily Chron. 25 Apr. 8/4 In the..dust coat the straighter and more sacky cuts will still predominate.