A field jacket and a navy denim shirt are the kind of a fail-safe casual combo that you need when you have no extra time to pull together an ensemble. For times when this outfit is just too much, tone it down by sporting a pair of white low top sneakers. When leaves change color and autumn is in the air, you'll love this combo as your go-to for summer-to-fall weather. This ensemble demonstrates how men in their 30s wow in the style department.