For an outfit that's pared-down but can be smartened up or dressed down in a ton of different ways, consider pairing a brown blazer with a white and blue vertical striped dress shirt. Bring a mellow touch to your ensemble by slipping into a pair of burgundy leather casual boots. Embracing the winter months is going to be extremely easy with such outfits as your fashion inspo. All in all, an ideal demonstration of smart casual style for 30-something Millennial men.