This topic addresses mostly civilian casual and formal business clothing. Sometimes you have no choice but using them in survival or outdoors situations.

Trousers

The ideal would be Filson's 17oz whipcord pants but if I had to wear more commonly available civilian wool dress pants, what type of weaving and cloth is best for winter use? When I ask what are your thickest and warmest wool pants in men stores, they always suggest flannel wool. But I tend to think that flannel will not shed the snow as well as a wool serge (with visible diagonal ribs). I asked if they have wool serge but one answered that wool serge is lightweigt and meant for tropical weather and I know it's not true. He told me that now people go to their heated office from their heated car and heated house and so on and that people don't want heavier wool pants and that now it's the super numbers that sells (like super 100 etc). I found that most of the sales people talk through their hats and just try to sell what's in store that's all. I asked another what is tweed and she showed me houndstooth pants and told me that this is tweed.

Anyway my question is is it better a twill wool (serge, gabardine) pants in winter or wool flannel pants?

Button down shirts

Which one of the two common type of dress shirt Oxford/pinpoint and poplin/broadcloth is more wind resistant? Because I have in mind of wearing a shirt under a knit sweater so that it acts as a windshirt (and a civilian looking shirt) to help stop the wind when removing outer environmental layers.

Thanks
Frankie