Why not consider pairing a yellow short sleeve shirt with olive chinos? Both pieces are super practical and will look cool combined together. Complete your getup with low top sneakers and the whole ensemble will come together wonderfully. It's is an obvious pick when it comes to a knockout summer-to-fall look. As a 30-something Millennial man, you want to start dressing more professionally. If that's the case, combinations like this prove useful as a source of inspiration.