This semi-casual combination of a grey shawl cardigan and a navy long sleeve shirt is extremely easy to put together without a second thought, helping you look awesome and ready for anything without spending a ton of time going through your wardrobe. Can you see how super easy it is to look on-trend and stay snug when fall arrives, all thanks to looks like this? As a 30-year-old gentleman, you want to start dressing more like a mature gentleman. That's when outfits like this come in handy.