“The Sultan of Suave,” “Couture Conquistador,” and “Guru of Glamour” are but three of the complimentary monikers Oscar de la Renta answered to in the course of his long and starry career.

This jazzy 2,000-square-foot boutique has coral stone walls imported from the Dominican Republic, plaster palm trees, and a shoe display set up like a catwalk. There's also a lounge (with de la ...