If you don't like getting too predictable with your combinations, marry a cardigan with navy chinos. If not sure as to what to wear in the shoe department, stick to a pair of black leather casual boots. All in all, a great example of off-duty fashion for guys over 30.
This pairing of a cardigan and navy chinos is the perfect base for a ton of dapper combos. A pair of white canvas low top sneakers instantly revs up the wow factor of this getup. This ensemble demonstrates that as a 30-something Millennial gent, you have a wide range of outfit options.