*EDIT* I've uploaded a new version which should work, I'd appreciate it if someone could leave a comment to confirm that it is working properly, thanks and my apologies for the previous version.
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I always thought it showed a lack of commitment that the clergy in the game wore regular clothing and fashionable hairstyles. So, this mod addresses that by giving all the clergy tonsures (if they are male) or cropped hair (if they are female), and dresses them in priest robes I made myself (retextured Black Robes).

This mod does not have any effect on any of the NPCs that are added to the Nine Divines Faction with the Knights Of The Nine plug-in. I didn't feel comfortable modding KOTN since it's an ESP file rather than a master, I'll make a KOTN expansion for this mod some time this month (after asking some questions on the forums).

I also added a chest to the Anvil Chapel of Dibella which is called the "Poor Box". The poor box contains some donations for the less fortunate, including a robe which the player can help himself to. Just so you can wear the robe around Tamriel without having to kill priests or nuns to obtain it :)