You'll be amazed at how easy it is for any guy to put together this casually sleek ensemble. Just a navy shawl cardigan married with a navy vertical striped long sleeve shirt. For something more on the casually cool side to complement your outfit, complete this look with a pair of grey suede slip-on sneakers. So as you can see here, it's an on-trend, not to mention spring-friendly, look to keep in your transeasonal wardrobe.