Looking for a winter pant that can be used for a few situations. I'm lucky enough to be close enough to my workplace to walk every day, so am looking for a pant that is appropriate for a casual office workplace but warm enough to handle a 15 minute walk in the winter with wind and snow. I have some great stretch fabric pants by marmot and ems that work well for 3 seasons, but the wind and cold are defeating them. Any suggestions?