I always liked the mandya or mantya of the Orthodox Churches.
As a
Glossary of Common Terms in the Orthodox Church explains, the mandya is a
"long, capelike episcopal vesture, usually purple in colour with ribbons and tablets which represent the law and the flowing streams of the Holy Spirit."I find the cappa to be more
'elegant' and
'baroque' with exactly the right amount of unnecessary fabric rustling around the prelate's arms. But as far as the variety of in-your-face colors goes, it is hard to beat the mandya. Here are some great photos that a kind reader sent in:

Watered silk,...
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... trains,...
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... (and then some)...
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... and color! Here's some purple.
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I love this blue-turquoise-ish color! Green... hmm... well, alright...
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More purple/violet/rose-ish
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And even...
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... black!
I wonder if there are any red mantyas?
Everybody wave, smile and say
"Thanks!" to sender-inner Kevin!