It's called Pakol or Khapo from Kapaal which means Head in Khowar-Chitrali. It is worn all over Pakistan but more in the North because it cold throughout the year there. Its other name is Chitrali Topi since it originates from the Chitral region of Pakistan.
The Nawab Muhammad Aurangzeb Khan's Darbar, Princely State Of Dir, North-West Frontier, 1919 (c).
Note - The Officer Setting In The Center Is Sir George Roos-Keppel, Chief Commissioner North-West Frontier Province, 1908-1919.
The Princely State Of Dir Was Located At The Foot Of The Lowarai Pass, The Main Route Into Chitral. A Durbar Was A Traditional Feudal Gathering That Dated Back To Moghul Times. It Was Resurrected By The British Raj As A Way Of Reinforcing The Loyalty Of Princely States To Their Imperial Overlord.