If that is all you got out of my post, I kindly invite you to re-read them both.

But if all you can focus on is clerical garb let us tackle that and be done with it.
It has nothing to do with aesthetics, it has to do with being visible. 

Actually signalling to the outside world that this man's function is to labour for the Church and care for those in spiritual need. 

It is a practical distinction for making the priest easier to approach. How else would you know it he was a priest?