Thanks for the link. Yes, I do mean post-WW1. Actually, post 1926 or so. Before that, they Poilu wore the Pattern 1915 Horizon Blue uniform. After that (approximately), the infantry wore Khaki. I just can't find any info on the khaki uniform the French wore beore being over-run by hte Germans.
I tried maybe finding period images of Magint Line guarisson troops thinking that might help, but couldn;t find any detailed pics of their uniforms... grr...