New York Fashion Week has officially commenced, so it’s safe to assume Ashley Olsen is busy. Like most luxury designers, she’s probably got places to go, people to see and runway details to finalize — all on top of being a mom to a young child. That’s why I wasn’t too surprised to spot the former child star rocking the ultimate comfy-chic outfit: baggy black jeans, easy slip-on sandals and a chunky V-neck sweater that made the combo feel special. Early September is technically still summer, but the 40-year-old was serving plenty of fall inspiration, so much so that her oversized black knit has...