The history of Kurdish trousers

Wearing the characteristic garment, which was typically pants, was the custom for more senior futuwwa members during the Abbasid dynasty. Many Kurdish rulers from the Abbasid era and beyond were given trousers as a gift. 

Al Jahiz has one of the earliest mentions of trousers in the Abbasid period. The military traditions of the Arabs and Iranians are contrasted in this text. The statement regarding pants is true. Because of their cultural heritage, the prominent figures in the futuwwa wore loose-fitting pants, which made them symbolic. For the people of the Iranian plateau, who were accustomed to riding horses with loose pants, it was an ancient outfit. The predecessors of contemporary Kurdish pants are those trousers.

Al Jahiz (9th-century): 

You did not use to fight in the night, did not know of raids and ambush,

or of right, left, center, and flank of the army; neither of the vanguard

or rear-guard, or of reconnaissance patrol and musculus (darrāja).

You had not known of war equipments such as wheeled convoy (ratila),

small mangonels (arrāda), mangonels (majānīq), armored vehicles

(dabbaba) or ditches or spike thorns, or coats of mail [aqbiya, pl.

of qabā'] or trousers (sarāwīl), or the hanging of swords, or of drums

or banners, or protective armor, or coats of mail (jawshan), or helmets

(khūd), or arm-guards, or bells, or lassos, or banjikān ['bows capable

of shooting five arrows in a row'], or hurling of oil and fire. Further

they say to the Arabs: 'Your javelins were made of elastic wood and

your spears were made of cow horns, and you used to ride horses

unsaddled, whereas the Persians had saddles. '