Marry a white v-neck t-shirt with black jeans if you wish to look casual and cool without too much effort. On the fence about how to round off your outfit? Wear black leather derby shoes to dial up the classy factor. So if it's a warm hot weather afternoon and you want to look dapper without putting too much effort, this getup will do the job in seconds time. Guys wondering how to sport smart outfits as you go through your 20s, you have your answer.