It’s a mod, mod world this spring. For their warm-weather collections, designers paid homage to the swinging ’60s and the era’s playful look. Graphic print pieces and A-like dresses rule the runway, and Lucite bangles, patent bags, and translucent wedges are among the season’s ’60s-inspired must-haves. To avoid looking too retro, skip the head-to-toe look and opt for one accent at a time. And for the ultimate in groovy chic, stick to a sleek black-and-white palette. —Susan Cernek