Marry a dark brown shirt jacket with black jeans if you want to look neat and relaxed without exerting much effort. You could perhaps get a bit experimental with footwear and play down your look with a pair of black canvas low top sneakers. As the weather warms up, it's time to get rid of those bulky winter layers and opt for something lighter, like this ensemble here. Wondering how to nail casual outfits in your late 20s? This combination is a great example.