Dressed in ceremonial garments especially clerical vestment(adjective)
WordNet. Princeton University. 2010.
Use "vestmented" in a sentence
"And yet this Syrian never served His mass without a thrill of something resembling fear; it was not only his knowledge of the awful dignity of this simple celebrant; but, although he could not have expressed it so, there was an aroma of an emotion about the vestmented figure that affected him almost physically -- an entire absence of self-consciousness, and in its place the consciousness of some other Presence, a perfection of manner even in the smallest details that could only arise from absolute recollection."