consider not wearing the windshirt unless its windy or snowing … i think too many people wear it just for the sake of wearing it
a light breeze is not a bad thing if you're active, as long as the frostbite areas (ears, hands, nose, etc …) are protected … it helps control the sweat … when yr stopped yr going to put on windproof insulation anyways
a windshirt is really for wind, snow repellency, and when you need warmth
like Tom, i find some wind shirts to be not very breathable at all
i always take an rain jacket up here … winter here means rain, slush and snow … and in a heavy snowstorm, a windshirt dwr may not be enough