Ambra Medda, Roger Vivier bag

Roger Vivier bag, $4,050, Roger Vivier, New York, 212.861.5371. Courtesy of the brand.

Roger Vivier’s Miss Viv was covetable from the moment it was released in 2009. Now, Ambra Medda, the über chic founder of the design site L’ArcoBaleno, has turned the bag into a certifiable classic. In the first of what will be a series of collaborations between Vivier and various creative folks, Medda has designed a rainbow-sequin version, available as a limited edition this month.