For relaxed dressing with a street style spin, choose a white and red print crew-neck t-shirt and light blue jeans. For times when this getup appears too dressy, dress it down by sporting white and black athletic shoes. It's a savvy pick when it comes to picking out a standout getup for weird fall weather. And if we're talking casual outfit ideas for 20-something gentlemen, this ensemble looks great on almost any gent.