Jennifer Garner has Us dreaming of Nantucket boat days, cozy sweaters and the kind of sneakers that make even a casual outfit look expensive. The actress has mastered that coastal rich-mom aesthetic, and her laid-back style is exactly what we want to copy this fall. Luckily, you don’t need a waterfront vacation home or a celebrity-sized budget to steal her footwear style. Garner recently shared a throwback photo on Instagram from a Nantucket boat day one year earlier. In the shot, she wore beige, retro-inspired SeaVees sneakers with an evergreen sweater, relaxed dark-wash jeans and oversized s...