A navy horizontal striped crew-neck sweater and burgundy chinos are great menswear staples that will integrate really well within your casual styling collection. A pair of boat shoes is a wonderful choice to round off this getup. So if you're on the hunt for a look that's dapper but also feels totally season-appropriate, this one fits the task well. When it comes to casual fashion tips for gentlemen in their 30s, this combination is perfect.