FFL wore dark blue coats from ...1831 to 1910. in africa they used to wear white jacket with or without coat . White pants for summer red for winter . kepi with white cover and back flaps from 1873 to 1905. In 1905 a new patern of cover arrived , without flap.
from 1910 to 1918 the main battle dress in africa (and turkey) is the sand color coton dress1901 (jacket with one buton row, long pants inside the black "gaiters" until 1915, inside dark blue or horizon blue putties from 1915 to 1917 inside mustard khaki putties from 1917 to ...1940
with pith helmet (white or with a sand color cover) .
The dark blue coat was worn by FFL for the last time in gallipoli february 1915 during the landing ( and at the start of these campaign, as blue horizon / mustard khkai arrived before the end of the year 1915 in dardanelles)
If you want to paint bataillon d'afrique, in algeria 1890/1914, they wore the same dress as FFL, the main difference in miniatures are buttons wich are silver instead of gold as well as laces on officers kepi and arms. Privates, had yellow laces (-one for first class, two for corporals silver for sergents and sergents major) In tunique, the collar is dark blue with yellow number. Epaulettes are green with red tournantes, with silver tournante for NCO.
the khaki wool coat didn't arrived in africa before 1917_18.
I hope i'am a bit clear ...it is not very simple ....
best regards
paco