We all see people ( including friends) riding around in t shirts and sneakers all the time. No one freaks out. On a forum it might seem like people are hyper. I even ride on very short rides - a couple blocks - in regular clothes. But once you get above say 40 mph the energy and friction that is going to hit you when you go down is enormous. The thing is, my crash - I was on a short spin, 4 miles to home, all alone, empty road, sunny and warm. If there was ever a time to not put on gear that was it. But I had forced myself to keep putting on the gear religiously. And so , here I am. This we owe to the people who care about us.