This combination of a white dress shirt and black chinos is surely impactful, but it's very easy to put together too. And if you wish to easily play down this getup with a pair of shoes, add a pair of desert boots to this outfit. So if it's a super hot summertime afternoon and you want to look sharp without exerting much effort, this outfit will do the job in no time flat. Smart casual outfits for 20-something guys aren't actually that hard, as you can see here.