cal·pac or cal·pack also kal·pac 
(kălpăk′, kăl-păk)
(kălpăk′, kăl-păk)n.
A large black cap, usually of sheepskin or felt, worn in Turkey, the Caucasus, Iran, and neighboring regions.
[Ottoman Turkish qalpāq; akin to Tatar and Uyghur qalpaq, perhaps ultimately from an Iranian source such as Middle Persian kulāfak, cap, diminutive of kulāf, hat.]