Am putting the finishing touches on the Pacific Coast Models Macchi 200 in 1/32nd and the decals are clearly laid-out for everything but the upper wing national insignia. The choices are the three fasci with white background or no background color. The plane I'm building served in Russia in 1942. All the research material I've seen says that it was up to the individual pilot or Squadriglia.
The box art shows the clear background.