To return to the original poster's question:
Sunglasses with a helmet, to me, looks stupid. Not nearly as stupid as some of the other things you see, either on the slopes or in this very thread.
Whether the original poster cares that I, and quite a few (though not all), other people think he looks mildly stupid is a question whose answer is best left to the original poster.
You should ski in a cowboy hat if you are either (a) Billy Kidd or (b) someone who thinks he can trick people into believing he is Billy Kidd.