In reply to OneBeardedWalker:
Can't suggest a specific make/model, but I picked up an end of line Haglofs gram comp gortex jacket in 2015 and it's still my go-to poor weather jacket, keeping me warm and cosy on several OMM elite courses and January trigger races. The hood is a textile engineering marvel. Starting to delam a bit now but can't complain after 6 years of abuse (rrp £250, sale price £125). I'll probably look for a new one after this winter and Haglofs will be top of my list. I also tend to look for named fabrics (gortex, eVent, the right pertex for some items)
As for super lightweight minimus type 'tracing paper' jackets - great for putting in the bumbag on a sunny day just in case/needing for a kit check. Don't waste your time/money, or risk your safety, if it'll be needed for more than a light drizzly couple of hours with minimal exposure risk. Seeing people rely on these things in proper ming on proper mountains really makes me worry about their knowledge/judgement/safety.
(Pulled out of OMM2017 Elite after selecting wrong jacket and getting cold after getting lost on Garamara for 40mins. Jacket was light but not super lightweight. Fine when running but not when standing still. Had I been in the Haglofs would have been fine. That was the OMM that got away - should have won)