So as you can see, looking sharp doesn't require that much effort. Just try teaming a navy and white blazer with navy jeans and you'll look incredibly stylish. If you wish to easily step up this outfit with one single piece, round off with brown leather tassel loafers. This combination is a wonderful idea when it comes to picking out a well-coordinated outfit for transitional weather. Think it's hard for teen guys to master semi-casual outfits? This combo will prove you wrong.