This is a site covering French uniforms 1914-18, with great drawings for a painting guide. If you can't get hold of L&F Funcken, this is as good. Takes a bit of navigating, or it might just be me.
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.