Extremely stylish, this laid-back combination of a navy denim jacket and black jeans provides with amazing styling opportunities. If you're on the fence about how to round off, a pair of black leather low top sneakers is a savvy pick. So if you're searching for an ensemble that's on-trend but also feels entirely spring-appropriate, this one fits the bill. Casual combinations for stylish 40-year-old gentlemen aren't actually that hard, as you see here.