Kippot come in a variety of fabrics and styles but if you're from specific Orthodox backgrounds, you tend to wear kippot made from velvet fabric.
Why did velvet become the norm exactly? Is there a halachic reason for the choice or was it simply a matter of "use what works" and they found this type to work best?
Similarly, why did they pick the number of "slices" for their kippot? Some velvet styles use six separate slices sewn together and other use four. Why is this choice so specific?
I'm more just curious about the history and why the Rabbis made the choices they did in this regard?