Mary-Kate and Ashley Olsen - ever the understated style icons - were seen working hard at their Hamptons-based store this week. The famous twins, 39, organized racks of meticulously curated garments inside of The Row's location in New York while dressed in matching black sweatshirts and effortlessly chic loungewear on Thursday, August 21, showcasing their signature minimalist aesthetic. Mary-Kate and Ashley kept it casual, going makeup-free with their hair loose and naturally tousled.