Humbrol colours:
Trousers: 29 Dark earth as a base. Battledress was much more brown than green.
Denison smock background: Not too picky, a light tan, mixed with a little light green if you like.
Green cammo, Humbrol no 30 is pretty good
Brown cammo, 113, or tone it down with 29 or 170 if that looks too red for your taste.
webbing: 93 os ok, but 93+72 is a bit better, not quite so yellow.
Hope this helps.