This pairing of a dark brown blazer and a denim shirt is truly jaw-dropping, but it's very easy to replicate too. Hesitant about how to finish? Complete your ensemble with blue athletic shoes for a more casual twist. A neat outfit that will take you from summer to fall like this one makes it extremely easy to embrace the new season. Those wondering how to rock edgy casual dressing as you progress through your 20s, you have your answer.