Sitting and staring into space impairs the success of your task. Becoming ill and losing several days to recuperation takes the profit out of the job, and we won't even go into the financial detriments of freezing to death. LLBean has it's catalog on the net, and it's one of the best. Take it off when you go inside so the heat can get to you. The construction people were hanging off safety belts a hundred feet off the ground with the wind blowing 30-40 mph and low temperatures.
Panty hose are great for lower body protection.
These boots have thick felt over socks for warmth. I also purchased a large quantity of heat generating packets for putting in the pockets of my clothing under the jump suit. I have a small electric heater purchased mail order for keeping the windshield from frosting over from breath. It does not throw enough heat to keep me warm. A can of sterno or a few candles will also generate some heat.