Some really great caps here. And I agree that blue and black fabric in the last cap is really great. I've made a few caps as a hobby. Nothing much to speak of, but to show here is one. GEDC0011 by Michael A2012, on Flickr
I was trying for something on the order of a 1910 ball cap GEDC0012 by Michael A2012, on Flickr
It's a sort of Donegal tweed wool or wool blend. I guess I've made quite a few now over time, mostly trying to figure out how to get it to work right. I've collected a few vintage and semi-vintage over that time too.
Thanks again for the welcome and also for posting this great resource for the study of caps.