Loving how this combination of a blazer and a sweater vest immediately makes any gentleman look smart and sophisticated. Want to go easy on the shoe front? Add a pair of black leather casual boots to the equation for the day. So as you can see, it's very easy to look sharp and stay comfy when colder weather comes, all thanks to getups like this. And if we're talking casual clothing for 30-something guys, this combo looks good on almost any guy.