I ski in a soft shell jacket that breathes pretty well.
I was wearing my USA ski-o jacket, which is one of those Bjørn Dæhlie jackets that seems to be compulsory to own in Norway. It is really really warm so I don't often wear it. But it was dark and it looked really cold outside so I did. And then remembered how warm it was and unzipped the front a lot and cursed the lack of zippable pit vents.