Yes. Originally they were worn mostly by monastics. Then bishops began to wear them because it was supposed remind them that their personal lives were to be lived as an aesthetic. The Christian monks were attempting to live lives similar to those who belonged to schools of prophesies in the Jewish tradition, such as Elias and Samuel.
Yes I have! Must be a carry over from Judaism. Did you ever take note of the popes prayer shawl?Not unlike the Jewish tails. Only difference that I see between a yarmulke and what the pope wears is that the pope has a knot like piece on the top of his.
The skullcap worn by the Catholic clergy is called a zucchini.
All Catholic clergy are entitled to wear the zucchini.
? The Pope's zucchini is white
? Cardinals are red
? Bishops are purple
? Priests and deacons are black
Some think that Zucchettos go back to when clerics shaved the center of their heads into a tonsure. Zucchettos would help keep their heads warm.