hats

I don't seem to be able to find a place to answer this. On the high end hats like the more expensive Borsalino hats. What are those shiny grosgrain ribbons made of? Is it 100% Polyester A mix of cotton and rayon? Is it silk? Or something third? Does anybody know?

I'm curious as to what hats you think go better with different situations. I just wear a grey fedora all the time, but what are your thoughts?