These Belts by Crossbreed have seven holes for proper sizing. The size you order will be made for use with the center hole. If you know that you prefer a belt with a longer tongue, add 1-2 inches to your measurement. If you prefer a fit with a shorter tongue, subtract 1-2 inches from your measurement. For most people, there is no need to change your belt size to allow for IWB carry of a single conceal carry pistol.