This laid-back pairing of a tobacco long sleeve shirt and navy chinos is very easy to put together without a second thought, helping you look dapper and ready for anything without spending a ton of time combing through your closet. Add brown canvas low top sneakers to the equation to inject a dose of stylish casualness into this look. As we all know, the trick to getting through the hottest time of year is sporting cool combos like this one. And if we're talking casual outfit ideas for 30-something men, this ensemble is perfect.