Make a navy waistcoat and white skinny jeans your outfit choice to create a dressy, but not too dressy ensemble. To add a bit of classiness to your outfit, complement your look with loafers. You'll always look stylish even despite the summer heat if you have this getup in your front hall closet. If you're working your way through your late 20s, pay attention to outfits like this to add more gravitas to your wardrobe.