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D.G. Hart has a quick bit of logic in favor of ministers donning a plain, simple robe in corporate worship. I think he is right on about ministers:
"Isn’t the nature of their work to get out of the way and let the word and Spirit do the work? And wouldn’t a robe that hid personal idiosyncrasies of sartorial preference and cultural breeding be a good way to remind the pastor that his work is not finally about him, his taste, or his social standing? "
http://oldlife.org/2010/10/22/why-should-chaplains-have-all-the-good-uniforms/