In general, I find RL pants fit a little loose in the waist. The waist generally has to be taken in a little for me. Otherwise, depends on the cut. The flat fronts are obviously a bit slimmer, but definitely still roomy. I like RLPL a lot.
There are quite a few models, aren't there? I find them to be rather full in the seat and thigh, and I am by no means super-thin. I have pretty solid muscular legs, though not stout. Just to compare, I find some of the Barbour moleskins of old to be slightly to tight for my thighs. And RLPL are a lot large in the thigh and seat than those.
Horace is correct, there's any number of models. I picked up a NWT pair a while back, relatively high-waisted, side tabs, with slim legs, but past seasons have produced everything up to Oxford Bags. When buying jeans/trousers on eBay, I generally ask for specifics: Inseam, outseam, width at leg opening, width at knee, and so on.
I find them to be a much slimmer fit then regular pants but I rather like that kind of fit now. Worth buying unless you're well above your optimum weight.
I would agree with this, at least for the RLPL slacks and suits that I have. For my taste, too, they seem to sit low on the waist (and, therefore, I always have the tailor let out the crotch as much as they can).