Cold Steel 5.5 inch Large G10 Espada. I also use this technique with my XL 7.5 inch Espada as well as a number of other knives that I rotate. Both of these knives have the clips positioned so that the handle protrudes above the waistband about 1 inch or so. Some of my other knives, like the SOG Trident, have what I refer to as a "Low Rider" or "Bayonet Style" clip where the top of the clip is at the same height or a little higher than the top of the handle. With a low rider pocketclip it is even easier to conceal your knife from prying eyes.
large knife in either the pocket or the waistband when sitting can be very uncomfortable (if done improperly) because the long knife handle will dig into your leg. I've learned to adjust the knife position from vertical to a more horizontal position or to slide the knife away from the centerline to my right side so that it is not uncomfortable when sitting.
Over the years, I've found that the only real disadvantage of the ITW Knife Carry method is that a really large knife like the Espada XL will telegraph (leave a visible imprint in the fabric) which may give the impression that you are well-endowed. With knives between 4-6 inches this problem is minimized.
Cold Steel thumb plate and the Emerson Wave feature enable the automatic deployment of the knife blade upon withdrawal from your waistband or pocket. In order to maximize the benefits of this carry method you should practice, practice and practice so you can quickly, efficiently and safely draw your knife while under stress.