Consider teaming a crew-neck t-shirt with grey jeans to bring out the cool-kid in you. Take a more relaxed approach with shoes and introduce dark brown athletic shoes to the mix. This combo demonstrates that in your late 20s your outfit options are in no way limited.
For a casually dapper getup, rock a crew-neck t-shirt with grey shorts — these pieces fit perfectly well together. If you wish to immediately play down your outfit with shoes, add a pair of dark brown athletic shoes to the equation. Gentlemen who wonder how to wear modern casual looks as you work your way through your 20s, this combo should answer your question.