In the halcyon days of the 1970s, day-glo Pucci prints were as ubiquitous as today's interlocking C's. Now, nostalgic fashion mavens and fluorescent-fanatics fill the line's two still-mod boutiques.

Inspired by an Italian palazzo, Emilio Pucci’s flagship store is decked out in solemn marble, glinting brass, and lofted ceilings—a dramatic setting to showcase the brand’s signature bright ...