Steppe Dress

Most Cossack Hosts wore an outfit only differing in minor details from normal Russian cavalry, especially in the field version. This should be a Cossack because he is carrying his rifle so that it comes out on his right hand side, whereas regular cavalry carried them the other way.
 

Basics

Traditionally Cossack trousers were baggy and blue, with very wide stripes of host colour. In practice khaki trousers were worn too, either with or without the stripe, and many were standard cut.

The boots were worn without spurs. Instead a nagaika whip was used.
 

Headgear

Most men seem to have worn the standard furazhka cap in decent weather. 

They also wore fur papakha, especially in winter. The further east the Host, the shaggier this becomes. The Don Cossacks favouring the small kubanka, whereas the Siberians tended to much larger and furrier items.

It was normal for Cossacks to wear their hats at an angle, sometimes alarmingly so.

Bashlyks were also worn in bad weather, but were not the brightly coloured things of the Caucasian tribes and hosts. Instead most were the natural colours of camel-hair cloth.
 

Weapons

All steppe Cossacks used lances. Imperial practice, and the Civil War units almost certainly did the same, was for a battle formation with the front rank lance armed and the back rank sabre armed.

The Cossack lance was of metal, and painted black. According to the Handbook it was shorter than the regular cavalry lance at 2.75 metres, although it says that Cossacks were moving over to the longer one (3.25m). Some English bamboo lances were used by AFSR troops. Pennons were not flown in wartime.

Officially men were armed thus: