For functionality without the need to sacrifice on style, we like this combo of a navy and white crew-neck sweater and light blue denim shorts. Introduce a pair of desert boots to the mix and the whole look will come together really well. As warmer days set in, it's time for breezy combinations like this one. Gents who wonder how to wear modern casual looks as you work your way through your 20s, this combo should answer your question.