School pickup, coffee runs, tennis lessons — Jessica Alba may have found a sporty-chic dress that can handle all three. Her preppy black-and-white style strikes that sweet spot between country club polish and genuinely practical style, and you can recreate the look with a similar Amazon find for $26. Alba was spotted showing off the sporty look on Instagram, wearing a black-and-white tennis dress with oversized sunglasses, a baseball cap and bar…