Flat sandals are intrinsically casual. They're definitely more casual than heels. That is, until you play with metallic leather, rhinestones, and beading, and then you have party-ready fancy flat sandals.
It's always refreshing to see Alexis Bledel. The fact that she paired Loeffler Randal's flat, strappy gold sandals with her Saloni watercolor print dress reminds us of her modern ferver. As well, Alexis is 5'7" and she doesn't look shortened by the long hemline and flat heel; the lightness of the outfit and her fancy flat sandals all flow, perfectly.