It is an iconic uniform garment worn by the Russian Navy, the Russian Airborne Troops (VDV) and the Russian Naval Infantry (marines). Dating back to the 19th century Tsarist Navy it was subsequently worn by the Soviet successors of these troops.
Sleeveless Telniashkas is traditional Russian Underwear for VDV, MVD and etc operators. Light, made from 100% cotton. Usually soldiers wear it under uniform, but sometimes, they wear it standalone.