Finding clothing out here will be easy, and I can't really comment on working outside for long periods of time. However, all of Alberta is typically not very cold ambient temperature wise, but because of the mountains rolling out onto the plains, it gets windy here. It's usually the windchill that gets you, and its always (in the winter) a cold, dry area to work in.
Layers will be your friend as the temps here can go up and down like a rollercoaster throughout the day. It's not too uncommon to get a 20*C difference in a day if a chinook rolls through, or a cold front comes in behind one.