I've never heard them called that before - it must be a British thing. Although the above clerical collar is not what has been in the news recently. It seems advisers to the Church in the UK are warning clerics not to wear their collars in public for fear of being assaulted. I doubt this is a very big problem with clergy of the American Church - many older priests rarely wear clerics. They already know the prejudice against priests because of the abuse scandals of recent years. Many good priests suffer because of the crimes of a few.