What to wear this spring? We've curated a Spring 2013 fashion guide of all the season's need-to-know trends—from pastels to florals to nautical chic stripes—with expert advice about how to wear them. Bonus! Editors' picks for the chicest spring 2013 fashion accessories: the shoes, bags and jewellery guaranteed to steal your heart and fire up your sartorial imagination—and your wardrobe. Spring fever starts now.