Quite right Jon about the secondhand stuff. Fortunately this stuff is brand new. Regarding how thin it is, the membrane is sandwiched between two layers to protect it (after all, it's only PTFE...plumber's tape!), so it stands up quite well from my experience. I did manage to rip my first pair when a stile collapsed and the barbed-wire nearly castrated me!
They are German army issue...Vorsprung durch Technik and all that so are well made and certainly not lightweight.
Dave, I have no idea how good the thermal liner is but if you're into the layering principle, it wouldn't be a problem to wear leggins,tracksters etc as well. I've been wearing the waterproofs with salopettes underneath when fishing in winter and the breathability has been superb.
As I've alluded to in previous posts on this matter, if your waterproofs lose their repellency (i.e. the water no longer beads and runs off) they will lose their breathability when its raining (or the outer layer is soaked through). However, on cold days they're great as a wind block and you don't 'wet out' from perspiration condensing inside your clothing.
Back in the late 80's I paid over £200 for a mountaineering jacket and £100 for salopettes (both Goretex)....the ones advertised here are £31 delivered! It's a no-brainer IMO.
P.S. The braces make them particularly comfortable to wear and the slightly higher than usual back helps reduce the effects of the cold. They get a 10/10 from me, but if camou isn't your thing, then look elsewhere.