This is very interesting. Too bad I was too young to remember the Latin Mass when it was THE Mass. :'(
Thanks.
I just wanted to follow up my comment by stating that these vestments (as far as I know) are still worn by our priests. (Just in case any non-Catholics are reading this)
Wasn't it true at one time that the outer vestment had to be silk? Was that ever true, and if so, is it still a current policy?