During WWI among GIs in France (not just the camoufleurs), it was common to organize masquerades and other costumed events and performances for the white Army "doughboys" (the US Army was not yet integrated, so Black soldiers were in separate units). Recently, I found a book on Entertaining the American Army: The American Army by James W. Evans and Garder L. Harding (Association Press, 1921), in which the costumes are described as follows:
"Many of these garments were contributed by actors and actresses back in the States. Winthrop Ames [a Broadway producer who organized an Over There Theatre League] sent over twenty-six trunks of costumes in June 1918. Here were Indian outfits, period robes, Uncle Sam suits, cowboy rigs, hoopskirts—everything a khaki actor might require.
According to The Chronological History of the Negro in America, by the end of WWI, 367,000 Blacks had been drafted, thus representing 11% of the ground forces who fought for American freedoms in France. Back home in 1918, 58 Blacks were lynched that year, up from 38 before.