Joe, Glad to hear you are basically okay after all that. Glad to hear that the gear worked well. But I am so sorry for your poor legs. My partner went down at high speed once and had gravel embedded in his legs because he was just wearing denim jeans.
I wear riding pants with armor on every ride, no matter what. I know from experience just how unprotective denim is.
When I was a young thing in High School, there was a group of us girls wandering around a university town supposedly looking for one of the girl's cousin.

At the point where there was a bunch of "boys" watching us I tripped and fell flat, right on my knee. My jeans shredded across the knee just from that slight fall and I felt like the biggest clutz around.

We all disappeared from there very fast and went back to where we were staying where I took care of my poor scraped knee.
All that to say that I've remembered that ever since, and when I started riding I knew I wasn't going to depend on denim jeans to protect me from even a dropped bike at a stop.