I've heard that this is commonplace in Orthodoxy (especially during the great entrance) when the priest passes by to touch his vestments, however I've noticed that no one at our Cathedral does it! Are there any general etiquette rules about how/when/where this is to be done? Also, what is the usual explanation for why this is done?
Also, we have typically 3 priests that walk in the great entrance. If I were to touch one's vestments, would it be best to touch the vestments of all three, or would just the Dean suffice?