Well, the Euzones you've posted are not just for show. They actually fought during WW1/Balkan Wars albeit in a slightly altered uniform. Granted, they do not fight any more and they are now solely guards of parliament and tourist magnets.
You think the modern Greek Evzones aren't real soldiers? They will fight, just as the British Guards will fight. Just not in their dress uniform.
The WWI Evzones uniform was not "slightly altered" though. Certainly not the ones who fought in the Odessa theatre. The jacket was khaki. The hat was a simple cap. Some even wore ordinary trousers and boots.
I any more do not know as you to convince...
There are MANY memoirs on participation in fights and red and white groups in an unusual uniform.
I never disagreed with that Cuprum.
Coloured hats and trousers were common enough. Coloured jackets seen sometimes.
But there is unusual, and there is silly. Metal parade helmets with plumes are silly.
Why you do not have questions, what the colour form could carry known Kornilovtsy, Drozdovtsy and Alekseevtsy? And as also many other things White military units...
Most of the men in the "coloured" units wore simple khaki, except for pogoni and caps.
It's actually quite hard to find a private in anything else. A fair number wore coloured caps, but not most after the huge expansion in early 1919. Black gymnasterkas were rare, except on senior officers.
(If you see a picture of a whole platoon in matching "coloured" uniforms, you can be sure it dates from after the war. Usually Gallipoli.)