I found toe rings, anklet chains, and multiple ear piercings to be under the juridisdiction of each elder body. That is, you could go to Congregation A and wear a toe ring without any problem but you could to Congregation B in the same circuit, even one that shared the same KH building, and they would not let you in your card had been transferred to that congregation. Of course, it wasn't a df'ing matter but "privileges" could be taken away.
It certainly did cause problems. In one case where two BOEs were battling over who was "right," they called Headquarters and were told that each BOE decided for their own congregation and not to meddle with the authority of the elders in another.