This casual combo of a tan fleece gilet and a navy chambray long sleeve shirt is super easy to pull together in next to no time, helping you look stylish and prepared for anything without spending too much time combing through your wardrobe. A trendy pair of brown leather derby shoes is an effortless way to inject an extra touch of style into your outfit. If you're wondering what you should wear as a gentleman in his thirties, this combo is a good source of inspiration.