Well the scarf on head was used by ancient Arabs to deal with the scorching heat the desert of Arabia has to offer- it covers their head- and their neck- exactly what modern science says to cover during heat-
The black tire as i call it on top of the scarf- is there to prevent the scarf to blow away with the high intensity desert wind-
and so it became their traditional dress-
it is indeed- but not the only dress that meets the Sunnah requirements-
The deset arabs almost conquered the whole word wearing their "thobs"-
and historically they beat the shalwar kameez wearing peope of south asia-
As the famous saying goes- its not the dress you wear- it all about the person wearing that dress- - unfortunately the persons wearing those dress today are cowards-
i hope you get the answer from my above post-