Get yourself some thermal long underwear to start you'll be amazed how much warmer you are.
This is some years ago but I bought most of my gear at Marks and found it decent. Some guys had Carhartt and liked it. As others mentioned, layers are key. Make sure some of your layers are zippered and and at lease one hood to add flexibility (most of us had zippered insulated hoodies as one of the layers, they really work well). The mornings and evenings iirc were the coldest, once the sun came out it sometimes felt much warmer and you need to be able to shed layers quickly.
I bought the best Sorel boots I could find at the time, might be better stuff out there now. They are clunky but did the job.
That jacket in the link is long, which might be ok depending on what you are doing. If you are carrying tools the belt will go around the coat and might restrict your arm movements. Lots of guys had overalls and a short jacket overtop for that reason. I wore a down vest as a layer, which helped with the warmth and the arm movement.
We used fleece gloves and experimented with others but I don't think there are any great solutions there.
I had a wool touque which would keep warm even when wet.
Good luck, hope that helps.
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