Religious orgs seem to have various positions. I don't assume it would do any harm to ask the leadership of the church. I know from the members I've only had positive remarks when I did it. Not a lot but those that commented were positive. I know the bishop of my ward (Mormon for Congregation) said they were not appropriate for my sons to wear. Other faiths for which I have sung, either as cantor or choir member, have never had a problem with them. Good luck and good wearing.