Marrying a navy cardigan with a light blue dress shirt is an on-point pick for a casually refined menswear style. Feel somewhat uninspired with this look? Introduce a pair of blue suede derby shoes to change things up a bit. So so as you can see, it's a kick-ass, not to mention spring-friendly, ensemble to keep in your transitional rotation. So if you're looking for a stylish and mature ensemble for a 20-something guy, this one fits the task well.