For a casual and cool look, team a navy denim shirt jacket with a black crew-neck t-shirt — these pieces play really well together. Rev up the wow factor of this look by rocking a pair of brown leather casual boots. There's nothing like a neat ensemble to spice up a gloomy autumn day. As you're moving through your late 20s, you probably want to start dressing like a grown man. That's when getups like this are a real lifesaver.