This combination of a navy blazer and khaki check chinos is a foolproof option when you need to look casually neat in a flash. Take a dressier approach with shoes and complete this look with a pair of dark brown leather tassel loafers. As we all know, the key to getting through the hottest time of year is sporting easy and breezy outfits like this one. More elegant combinations like this work well on 30-somethings.