Good base layers should be formfitting — not tight ... “It wicks moisture away from your body, which also makes the clothing extremely breathable and odor resistant.” On a basic level ...
In Nordic regions, they have an old proverb that says: There’s no bad weather, only bad clothing ... ever since I discovered the merino wool base layer, I’ve been able to stay out longer ...
One of the most obvious places to start protecting yourself from the cold weather is a trusty set of base layers ... making mincemeat of your clothing however many layers you add, maybe consider ...