Kazakh women's hats on the fluffy thing is made of what, other ethnic groups wear this hat?

The fluffy stuff on the Kazakh women's hats are owl feathers

The owl is considered by the Kazakhs to be an auspicious bird, so they like to decorate their hats with its feathers

Many people think that the Kazakhs hurt the owls and use their feathers for decoration

But in fact, it is the owls who lose their feathers every year, and the Kazakhs collect them every year

When their girls grow up, they have many feathers, and they decorate their hats with these feathers. By the time their girls grow up, they have a lot of feathers, and they decorate their hats with them.

Other peoples, like the Kirghiz, have similar hats.