It was 1.5* C when I left for work this morning. I had on thermal tights and a thermal top, with an underarmour type shirt on as a baselayer, and a pair of winter cycling gloves, wool socks and my overshoes. Plenty warm enough. It doesn't get too much below freezing over in the UK, but if any colder, a merino base layer and maybe a wind/rain proof jacket over the top of me. Balaclava for face and head if windy. Arm and leg warmers for anything 8*c-14*c. Legs out over 15*, arms out over 18*.