I'd have to disagree with this, a size 32 unstretched measuring at a 34 waist for example, and that's not really to allow for shrinkage in the first wash.
OK yeah i meant "accurate" in the sense of being comparable to other jeans sizings. I think they are all a bit vanity sized in the end. also for lower cut jeans popular at the moment its really the hips they sit on rather than the true waist. the latter will be narrower if you're young, and wider if you're older