http://www.jewishworldreview.com/1107/leibowitz_clothes.php3
This is very common sense, and I am sure all the "book-religions" give similar advice...
Yet, certain Catholics have a tendency for the ostentatious. Maybe, that's because many Catholics don't really live by the book?
I thought this was going to be something about the prohibition of shatnez!
Of course, Dr. Teplitz. Rabbinic law does not classify goat hair as "wool," so you're home free with a cashmere/silk/linen blend.