In reply to Kryank:
I assume it's for belaying in...
Being an armchair warrior tonight, if it's for leading in......
Maybe consider it's too cold for trad?
or you're climbing too slow
Or you're not climbing hard enough.
Or you need a new support team who'll preplace a jacket in the correct place going forwards.
Lol.
Being even less help, I have some phd kit which I can put on at belays etc, also have a thinish stretchy but we'll tailored wind proof type job which I find does wonders for cooler days climbing without being silly and over the top when climbing.
A full on belay jacket I'm not sure I'd want for trad unless just belaying single pitch stuff. Then I borrow my mates, pre warmed too.