The dress of Turkic people and Iranian is entirely different from the kind of Kameez worn by Muslims in Afghanistan and South Asia.Ottomans also used to wear loose şalvars
and rarely still seen among elder Turkish people from the country side
and you can also see that in traditional Kurdish cloth,
+ as i can recall Mamluks also wore loose pants and maybe other middle easterners too.
so i guess there is some common origin somewhere for these all...