I just finished So You're Going to Wear the Kilt.

The author advises that the proper way to wear the kilt is above the kneecap and maybe even an inch or so above the knee cap. In fact, he literally dismisses the technique of kneeling and measuring yourself from the floor to the navel.

I wonder what others who are serious about wearing the kilt in formal and daywear settings have to say about this and why most kilt sources still use the floor to naval method.