Mary-Kate wears her topshop sweater with a pair of gladiator sandals, Ray Ban Wayfarer sunglasses and a bright handbag.
What concerns accessorizing, i think Olivia is definitely the one who's gonna win this little battle. ... I mean, what better way to spice up your outfit than with a male model by your side? ;)
Or are you the kind of girl that preferes a rocker boyfriend with an "I just got out of bed" look?