When the situation permits an off-duty ensemble, you can easily wear an olive vertical striped short sleeve shirt and navy chinos. If you don't want to go all out formal, introduce olive leather sandals to the mix.
Olive Vertical Striped Short Sleeve Shirt with Olive Leather Sandals Outfits For Men
You'll be amazed at how super easy it is for any guy to get dressed this way. Just an olive vertical striped short sleeve shirt combined with navy cargo pants. Olive leather sandals are guaranteed to give a dose of stylish casualness to this look.