Nothing special, I realised ages ago that bike specific clothing is a bit hit and miss, I had an expensive Altura rain jacket that was coming apart after just a few uses, a Merino top from Aldi that was never comfortable and shrank in the wash, padded shorts that were impractical.
So these days I'll just wear a pair of pyjamas underneath some loose fitting combat trousers if it's really cold. My trusty Dr Marten's which I've waxed a few times so they are totally waterproof, pair of ten quid gloves, and a woolly hat!
I did pay quite a bit for a Helly Hansen Moto Jacket, but it has been great, three years old now and still going strong, very well made.
+1 for EDZ layering (based in Cumbria) base layers or Endura lycra base layer under a thin top, then topped off with a cheap padded Dunlop hi-viz work jacket from Sportsdirect, non breathable but very warm in these low temps. As for overtrousers my best purchase this year is Gelert walking overtrousers which are lined to keep the cold off my knees, also from Sportsdirect. Also to avoid a headache a helmet rain cover to keep the cold wind and rain off my head.