I have one of the original custom sized one piece suits. I got hit by another bike and knocked off the track.
Went down in the sand, gravel, dirt mix type stuff face first at about 70. Landed on my front left shoulder and chest area. Silde face down till I stopped. No damage at all to the suit. As I was sliding, I felt like I was in a cocoon. The plastic shoulder, forearm, and knee pads really did the trick. When I got up I knew immediately I was not hurt in any way. I know the gravel is softer than pavement, but you can't tell the suit was in a crash. All stitching held fine. I'm happy.