Sorry, didn't want to offend anyone but it really looks like native american clothes, at least to me 
Yeah, there are really many similarities betweeen native american and central asian nomad people.
As for the ottoman deli's, they also look like native american:
About delis:
http://de.wikipedia.org/wiki/Deli_%28Soldat%29 (no english article)
Within the Ottoman Army (Ordu-yi Humayun), Deli forces were light cavalrymen recruited in the frontiers under the command of the Rumeli beylerbeyi and sanjak beys. Due to their extreme courage, extravagant clothes and willingness to attack the enemy without hesitation, these soldiers were named deli, literally mad head in Turkish. These unique soldiers were among the most amazing and interesting units, not only in Ottoman history but also in world military history.
Deli were first seen in the 15th century and were abolished in the 19th century. They adorned their clothes with eagle feathers, eagle wings, lion or snow leopard pelts, and wore trousers made from bear or wolf skin. Their pointy yellow boots carried foot-long spurs. The aim of wearing this extraordinary clothing was to create panic and fear in enemies unfortunate enough to face the Deli in battle. With their terrifying appearance, determination, and willingness to fight in a superhuman manner, they served the Ordu-yi Humayun well for many decades, and were imitated by the enemies of the Ottomans for years to come.
The deli soldier from the osprey book, was my reference for deli cap model.
