Consider the Finisterre Caelus parka. I've bought one. 170g/m2 of Primaloft insulation. Based on PHDs statistics it should be good down to about -15C! Or consider from Blacks 66 North Snaefell Down Parka.
Bergans Finse trousers are waterproof cotton but for cold weather you'd have to wear something warm underneath them as they aren't very warm. I run hot and wouldn't wear them on their own below about 4C if that helps.