For a casual menswear style with a fashionable spin, rock a brown wool shirt jacket with white jeans. And if you wish to effortlessly dial up your outfit with shoes, why not introduce dark brown suede loafers to the equation? So as you can see here, it's an on-trend, not to mention spring-appropriate, outfit to have in your transitional rotation. If you're wondering what you should wear as a 30-something man, this outfit is a good source of inspiration.