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Canon XXVII.
The Quinisext Council in Trullo (692) · The Seven Holy Ecumenical Councils
None of those who are in the catalogue of the clergy shall wear clothes unsuited to them, either while still living in town or when on a journey: but they shall wear such clothes as are assigned to those who belong to the clergy. And if any one shall violate this canon, he shall be cut off for one week.
Trull 1.28.2