It's the armour plate for close support that made me look it up.
I don't think that gets added until wide use of machine guns.
Garb does indeed look quite WWI, now that you mention it.
(
Tahkcalb ω∞ for sigs,
Fri 1 Jan 2010, 9:22,
archived)
Apparently 1903 issue.
I'll have to get some chaps from The Diehards to pose for a few shots...
(
Colonel Boris "...a desperate Buzzfeed imitation...",
Fri 1 Jan 2010, 9:29,
archived)