If you're on the hunt for a casual and at the same time on-trend look, wear a red and navy long sleeve shirt with navy jeans. For extra style points, finish off with casual boots. Laid-back looks for gents in their thirties aren't actually that hard, as you can see here.
A big thumbs up to this casual pairing of a red and navy long sleeve shirt and olive cargo pants! Introduce a pair of casual boots to your outfit to instantly bump up the fashion factor of your look. Gentlemen wondering how to pull off modern casual style as you mature into your 30s, this ensemble should answer your question.