QUOTE(Hoplophile @ Sep 26 2007, 11:13 PM)
Where the application of colour to black and white pictures is concerned, I must confess that I am entirely bereft of the 'Ted Turner touch'.
That said, I would suspect that the coat would have been khaki, with the exact shade left to the discretion of the officer and his tailor. (The officers who served with the tirailleurs marocains tended to be somewhat inventive when it came to the details of their uniforms.)
The most famous of the French officers who served with the tirailleurs marocains during World War I was Alphonse Juin, who commanded Free French forces in Italy in World War II. Thus, biographies of Juin, as well as the French equivalent of the National Portrait Gallery, might be a good place to look.