>Even though I'm not sure what a " V'tullian high priest's cloak" looks like

It has red sequins across the chest that spell out "V'Tull Rocks."

Seriously though, everyone knows what the Pope's outfit looks like, for the most part. On the same note, if you see a guy all decked out in red (cassock, mozzetta, zucchetto, and biretta) a good portion of the populace will say "oh, look, a Cardinal." Same goes for a Franciscan monk's cassock. "You" may not be sure what a V'Tullian high priest's cloak looks like, but someone who lives in a place where priests of V'Tull wander around in official raiment would.