Agree with the tailbone coverage. It would probably be a bit subjective given the variations in design, and individual torso length etc. Good comment, something we ought to consider in a rule proposal.
Also, I agree with the medical form requirement...another rule change proposal.
The one part I left out of the rulebook post I made:
6.5 All competitors must carry a copy of the “Medical Information and Treatment Authorization Form” (provided by the WMRC) in their leathers, preferably in a small pocket in the chest of the leathers. It is also recommended that the competitors carry their medical insurance plan cards or papers with them in their leathers.
I'll attach a soft copy of our form for your use if you'd like (it's the 3rd page of our application). We print it out each year in a different colour to make sure information on the forms is current. I place mine in a small plastic baggie as the inside pocket of my leathers tends to get moist.
Here is a link to the form: http://www.wmrc.ca/documents/documents/2009WMRCReg.pdf
I can't attach it as a PDF to this post as the maximum PDF allowed size is under 20K.