I'm guessing "APPENDIX D4 ? Production Division", Restriction on position of holster and other equipment: See Appendix E3 which says, "Foremost limit for gun, holster and all equipment behind the hip bone."
I learned something. I assumed you could have gear there but not use it during COF. Oh well, it is much easier to enforce this way. Anything in front of the hip bone and you will be in Limited or Open (or Revolver).