I never thought " Rihanna " and "minimalist" could belong in the same headline. I associate Rihanna with styling Louis Vuitton for a CVS run or remixing colorful Loewe and Comme des Garçons into maternity clothes —sampling the pared-back restraint of a Carolyn Bessette-Kennedy . But even Rihanna saw the high-vamp flats trend , the minimalist spring shoe trend du jour , and decided she needed to step up her understated footwear game. The last time I saw Rihanna, she was ascending the Met Gala steps and Marie Claire' s best-dressed list in custom Maison Margiela . The dress was less of a dress and more of a space-age cocoon, combining liquid metal fabric with an assemblage of crystal embellishments. In other words, she was the walking definition of maximalism. All of a day later, she made a 180-degree turn toward the minimal with her post-Gala outfit. Rihanna wearing a maximalist Maison Margiela dress covered in pearls, brooches, and mixed metals.…