It’s quite a common thing in the UK to take on Muslim woman’s garb for a short time to experience what it is like to wear the hijab and see how differently you are treated. I’ve done it myself, and it is fascinating social experiment. I was mostly treated with gentle deference, but did get called dirty by one passerby.
This gentleman’s experience with the cassock seems of a similar order, and, I think, a fruitful exercise.
As to what clerics wear more generally, my female vicar friends almost all wear a collar, some with exceedingly funky shirts and tops. I’ve met a number of free church pastors who wear collars, but my good Reformed Baptist friend contents himself with a small fish pin on his jacket lapel.
My own dear Father C wears a cassock, and even came in out of the rain on Thursday wearing a magnificent black cape over the top of it. He’s a young man but a bit of an old soul.