Well, I have worn my Royal Robbins pants for an extended weekend and have the following observations.
They DO run large. I bought my normal waist size, 38", and they are very loose on me. In fact I could easily wear an IWB holster. However they are comfortable and feel good.
The pockets are deep, almost too deep. At least the rear pockets. I can carry my 2" Charter Arms Undercover in a pocket holster in my right front pocket and it stays put. I am still trying to figure out how to best use all of the other pockets without weighing the entire outfit down too much.
For winter wear with an IWB holster I think these will work. However I think that I will try a 36" pair to see if they fit better.
Thanks for all the input.