I failed to find an English version of this brief description, but a German version might also give an idea:
http://de.wikipedia.org/wiki/Deli_%28Soldat%29This group called "Deliler" (meaning "Crazies") was formed of young soldiers who were very bold and fierce, too bold to be called crazy as they were the first group of line to attack the enemies all the time. Their most recognizable outfit were animal skin ( mainly bear, lion, leopard and hyena ) coverings with feathers. They were not really a heavy infantry type, but were fast and deadly. There's also a relation between these guys and the world fame "Ottoman Slap". It is rumored that as these warriors had only one handed weapons, they used their free bare hands to slap the enemy. When you think about it, this might be true considering they frightened the enemy line a lot. There should be a reason, right?
Although its historical background, this hat is truly the most fashionable hat in cRPG arsenal. It inspires poeple to take up a new look.