This combination of a grey double breasted blazer and chinos crosses the divide between elegant and casual. You can take a more relaxed approach with shoes and complete this ensemble with a pair of aquamarine athletic shoes. As a 30-something Millennial man, you want to start dressing like an adult. In this case, combos like this are perfect as inspo.
Try pairing a brown overcoat with chinos and get ready to be recognized as a maverick in the menswear department. On the fence about how to finish? Introduce aquamarine athletic shoes to your outfit for a more laid-back touch. If you've passed the big 3-0, take cues from ensembles like this to add more seriousness to your personal style.