 Saint-Cyr closed her salon in 1964, but began working with French milliner Jean Barthet – a supplier of hats to celebrities such as Princess Grace of Monaco and Maria Callas.This working relationship continued for the succeeding eight years, after which she retired from millinery design but continued to act as a consultant to bridal design houses until the mid 1990s.Examples of Saint-Cyr's hats are held by a number of museums worldwide, including the Metropolitan Museum of Art in New York.