Marrying a white crew-neck t-shirt with black vertical striped dress pants is a savvy idea for a casually sophisticated outfit. As for footwear, complement your look with black leather casual boots. This outfit is a really nice idea, especially for autumn, when the temperatures are falling. You can take cues from ensembles like this if you're working your way through your mid-20s and you want to take a more serious direction in your style.