Why not try pairing a navy long sleeve shirt with olive cargo pants? Both of these items are very functional and look good when married together. Put a different spin on an otherwise standard getup by slipping into a pair of dark brown suede desert boots. Those who wonder how to pull off edgy off-duty outfits as you pass the big 3-0, this pairing should answer your question.
Navy Long Sleeve Shirt with Dark Brown Suede Desert Boots Casual Warm Weather Outfits In Their 30s
If the setting allows a casual getup, marry a navy long sleeve shirt with navy jeans. Add dark brown suede desert boots to the mix and you're all set looking boss. As you see here, as a 30-year-old gentleman, you have a wide range of dressing options.