If you don't take fashion too seriously, go for a laid-back getup in a dark brown blazer and navy jeans. A pair of dark brown leather chelsea boots immediately bumps up the fashion factor of any getup. Ensembles like this have a sophisticated air that befit 30-year-old gentlemen really well.
Dark Brown Blazer with Dark Brown Leather Chelsea Boots Smart Casual Cold Weather Outfits For Men In Their 30s
When the situation calls for a classic and casual menswear style, team a dark brown blazer with navy jeans. A pair of dark brown leather chelsea boots easily amps up the style factor of your look. All in all, a fail-safe choice if we're talking outfit ideas for 30-something men.