Hi Johnno. I must disappoint you. I've never heard of such a detachment of the Red Army. The Reds often met "eagles" - for example, the "Regiment of Red Eagles" ... There were "iron" and "steel" regiments and divisions. On the "wolves" I have not heard. But in the white army, ataman Shkuro, had its own "wolf hundred". The gray uniform after 1922 was prescribed for the entire Red Army. But in fact it was used on a par with the uniform, sewn from a khaki fabric of different shades. The black uniform was prescribed to the prison guard, the transport department of the Cheka (Responsible for protection of railway and water transport), black leather uniforms had crews of armored vehicles.
It can theoretically be assumed that during the Civil War some of the red cavalry units could have a completely black leather uniform. But I do not know such facts.
Uniform of the sample 1922 (existed before 1924):

Shirt and helmet - summer; Shirt and helmet - winter

Winter uniforms

Summer cotton helmet

Winter cloth helmet
The colored details of the uniform (in the drawings black) had a different color, depending on the kind of troops. In cavalry, the color was blue with a black edging.