Men of the Malay Regiment wearing peci at bayonet practice
A peci is a cap of IndonesianMuslim origin, in the shape of a truncated cone, similar to fez but almost always made of black felt. In Malaysia, Singapore, and Brunei it is known as a songkok. In the Philippines, the same hat is known by the name kopia.
In Indonesia the peci has become its national headdress, with secular nationalist connotations, made popular by Sukarno. Peci is worn by male Indonesians in formal situation, wedding ceremonies, or religious holidays such as Indonesia's Idul Fitri and Idul Adha.
Peci is also worn in Malaysia, notably by the military and police of Malaysia and Brunei on ceremonial occasions.