Andy
Very nice figure. As a detail, Voss was initially a husar with 2. Westfalisches Husaren-Regt. Nr. 11, when the war broke out. When he applied for pilot training in August 1915 , we was promoted to Unteroffizier. He was commissioned as a Lt. der Reserve in November 1916. As with most officers in the air service who came from previous units, he would have retained his prior regimental uniform, but with the addition of the flieger props on the shoulder straps. Your figure is wearing a Kleiner Rock (undress tunic), and the insignia would be as such: red piping at the edge of the collar and leading jacket edge, dark green on the collar patches and the shoulder strap piping. The buttons would be in silver. Also, the collar itself, would be in the "apple green" color used in the bluses, and the body of the tunic would be in feldgrau. Hope this is of value to you.
Regards
Dave