grosgrain

Hi there Loungers, I'm in need of some help. I'm urgently looking for a Black Silk Grosgrain Self Tie Bow tie. Have a black tie event on the 25th/3rd (Next Week) and have yet to acquire a bow tie. I've looked online and prices are...well I'm a student I'll put it that way. If any of you know...

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?