40 years ago I went down at 50mph without any riding gear... It was an awful painful expierence that lasted for months. Not quite as bad as the time I jumped sand dunes and went in face first with my mouth open. I got all "choked up" over that one.
Then my wife and I were hit head-on by a woman who just flew past a stop sign and hit us head-on. At that point I figured I was well protected by a hellmit, jeans, Tee shirt, etc. After leaving the hospital, I was stuck on a couch for two weeks before I could even get up and go pee. And even that was difficlt with two casts on my arms. Forget about going #2, it was good to have a wife. Did I mention my crushed leg and football size foot? Oh, and a fractured back was big fun too... At least I got to watch 911 on TV as it happened, since I couldn't move anyway. Kinda pointless screamin at the TV sayin; "Let me at those guys!" when I was basically just a vegetable, huh? However, since the only decent riding gear I had on was a hellmit, I didn't die from the impact of flying thru the air and landing on my head and right shoulder.
In 2004 I was actually geared up pretty good with hellmit, leathers, boots, ect. when I was hit from behind while turning by another bike going at least 65mph. Even with gear I ended up with two broken wrists, broken arm, broken nose, and my face crushed in breaking off a section of my skull. At least I didn't suffer any major road rash, LOL. Of course my brain had bounced off the front and rear of the skull inside causing the loss of a few very useful brain cells, but at least they did bolt my skull back together so I still looked "Purty"... And, they used that "high quality" plates and screws made from titanium. That was thoughtful of them because I don't set off alarms in airports now...
If you ride casually dressed because you think there is no chance of you going down, get ready for some serious pain and make sure your doctor gives you good pain meds...
If this happens to you, I have lots of good info on assisting recovery I will share if needed. I am considering writing a book. How to make those anoying motorcycle injuries fun and exciting, by jimbob