[quote=@Cao the Exiled]
[@Rush99999] does the robes have any distinctive marks or sigil on them? Any mage's mark comes up with detect magic?
[/quote]

No distinctive marks beyond leaves, twigs, and animal bones. The more ornate robes worn by Emmyth, Elnaril, and Nanna May had those sorts of things; but the rank and file cultist were issued more basic stuff.