Rock a grey knit blazer with navy jeans to assemble an interesting and current casual outfit. Serve a little mix-and-match magic by slipping into a pair of dark brown leather oxford shoes. So as you can see, it's super easy to look amazing and stay snug come chillier weather, all thanks to outfits like this. This combo illustrates how to keep killing it in the casual style department as a 30-something Millennial man.