Another trend this London lady was wearing way before the rest of us: mixing more than one necklace. How to do it right? “Necklaces should be different lengths, so they don’t tangle, and they should hang together style-wise,” Bloch says. To mimic what’s here, pick chains that are all light and delicate with charms, he says. “The different lengths are crucial because then you can see what’s on each one.”