This pairing of a navy bomber jacket and black vertical striped chinos is hard proof that a pared down casual ensemble doesn't have to be boring. Inject your outfit with an added touch of class with a pair of black leather chelsea boots. So as you can see, it's a stylish, not to mention season-appropriate, combo to keep in your transitional sartorial arsenal. And if we're talking style for 30-year-old gents, this combo is perfect.