If we are talking IWB carry, then it is a REALLY big gun. There is no way the pistol will fit IWB, and even if you manage to get it to fit, it would be mighty uncomfortable to have that huge mass pressed in against your kidney.
The few times where I did attempt to CC the LeMat on my person without a backpack or haversack was when I was wearing a really heavy greatcoat on a particularly brutal day and the gun was riding inside one of the inner pockets of the coat. And that was for experimentation only, due to a thread on a different site where someone wanted to CC a Walker. I wanted to see how large revolvers of that class could be carried without being placed in a separate piece of luggage. And even with a coat of that weight, the LeMat is HEAVY when fully loaded.
There are NINE .454 balls inside weighing at 140 grains each. Each with 33 grains of FFFg black powder behind them. And then 50 more grains of musket powder in the central barrel and a .63 ball on top of that along with a lot of cotton wadding to make a good gas seal. That adds a lot to an already heavy gun.
As a backpack gun though, that is what this gun is designed for in the first place. It was intended for the saddlebags of a mounted trooper, and for infantry use, this thing most likely rode in a backpack as well, in a side compartment or near the zipper. Extremely easy to reach around in a crossdraw, pull it out and deliver a rapid and effective shot.
As a combat weapon the LeMat is unparalleled. It holds more ammunition than a 1911 or ANY single stack auto without an extended magazine. And those who are well versed in combat knows that getting a good sight picture in time is what wins a fight. And in that department the LeMat excels as well. The sides of the hammer extend above the hammer nose to form an open square bracket like the Chinese character kou The front sight notch, when lined up in between that bracket, makes the character zhong. When the threat is being viewed through that zhong, it means that threat is going to have a very bad day.
I have tried to practice instinctive shooting with the Remington but the rear sight bracket, unless unmodified, is rather hard to pick up. On a Colt, the hammer notch is also small and difficult to pick up in a split second. The LeMat sights however, offer the best combat style arrangement in my opinion. That is on the NAVY model revolver by the way. I don't think the Cavalry or Army hammers have that extended side bracket.