
All material and reconstructions are by A. Karevskiy unless noted otherwise.
The reconstructions of the insignia and uniforms of the Irkutsk Cossack Regiment are based on photographs published in:
"White Russia: Photo Album", Moscow, 2003.
"Cossacks of Russia in the White Movement // White Guard special issue", Moscow, 2005.

Shoulder-boards of the Irkutsk Cossack Regiment:
1 – lieutenant; 2 – ensign in the regimental machine gun komand ;
3 – corporal; 4 – lance-corporal in the regimental machine gun komand

Uniforms of the Irkutsk Cossack Regiment
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The original for this page is at kolchakiya.ru/uniformology/Irkutsk_reg.htm.
Note that the U-shaped letter on the shoulder-boards is the italic version of the Cyrillic "И", so an "I".
Discussion on the translation choices I have made can be found here.
The regiment formed in late 1919 and garrisoned Kansk. It disbanded there with the collapse of the front. It may have fought local partisans.
This regiment was formally part of the Enisei Host and wore their uniform colours. Some more information about that host can be found here. Their uniforms are here.