You'll be amazed at how easy it is for any gentleman to pull together this casually smart look. Just a cardigan and a navy and white long sleeve shirt. You could perhaps get a little creative when it comes to footwear and elevate this look with a pair of charcoal suede tassel loafers. This outfit is a savvy option when spring sets it. As a 30-year-old gentleman, you probably want to start dressing more maturely. If that's the case, inspiration like this comes in very handy.