This smart casual combination of a black blazer and a white polo can take on different moods depending on how you style it. Don't know how to round off? Make grey suede low top sneakers your footwear choice to jazz things up. So if it's an extremely hot hot weather day and you want to look sharp without putting too much effort, this outfit will do the job in no time. Guys who wonder how to wear cool off-duty outfits as you make it through your 20s, this combo should answer your question.