Also known as: mazepinka
The Mazepynka (Мазепинка) is a Ukrainian Military Hat. Created by Levko Lepkyi for the Ukrainian Sich Riflemen in 1916, it was named after the 17th-century Ukrainian leader Ivan Mazepa.
It consists of a Field Cap with a flat top, a stiff brim, and a prominent V-shaped notch centered on the front. Usually decorated with the Tryzub emblem or other insignia.