A white crew-neck t-shirt and charcoal sweatpants are indispensable must-haves if you're figuring out a casual wardrobe that matches up to the highest sartorial standards. Go ahead and introduce a pair of blue canvas low top sneakers to the mix for an added touch of sophistication. Rest assured, this combo will keep you warm as well as looking sharp in this awkward fall weather. And if we're talking casual style for 30-something Millennial gentlemen, this combination is ideal.