Between the dark, oversize glasses, loose-hanging ombré locks, and high-fashion ensembles [1], it's no wonder some people have a hard time telling Mary-Kate and Ashley Olsen [2] apart — could you imagine how much harder it would be if they still wore matching outfits like they did back in the day [3]? You might think you're an expert, but we're here to put your skills to the test: are these photos of Ashley or Mary-Kate?