In reply to captain paranoia:
> The alternative to stretch is to find something that has a well-designed armscye and sleeve, so that it doesn't pull out of the harness when you raise your arms over your head.
Yes, and this comes down to body shape and differing designs and dimension between brands.
I got one of the first generation Rab Boreas and used it in Peru. It's a useful thing for trekking, I think, and maybe multi pitch climbing, but too much of a compromise to take on many trips. Plus it's got the dodgy Rab fit of narrow shoulders and billowy waist. It's more wind resistant than a fleece, but not as warm, and more breathable and comfortable than a shell or membrane-softshell.
Pertex is not completely windproof, not should it be. Anything that was 100% windproof, such as a 'waterproof' is not going to be breathable and thus negates the point of using not-a-shell. As others have said, some understanding and acceptance of the compromises is needed.
I find VR-type garments (Driclime etc) too binding and warm for lots of stuff. I go much better with an Arcterxy Squamish over a base layer or thin fleece. It fits me well, doesn't bind and is slightly stretchy. Maybe too flimsy for regular rock thrutching though.