A crew-neck t-shirt and khaki chinos are a good outfit worth having in your off-duty styling repertoire. For something more on the elegant side to finish your look, add brown derby shoes to the mix. This outfit is a viable choice if you're piecing together a standout look for unpredictable fall weather. So if you're on a mission for style ideas on how to dress as you mature into your 30s, this combo is perfect.