"There is much being said that his passing yesterday marks the end of an era," she wrote in an open letter in Vogue on Tuesday. "Not true. He was the most democratic man I knew and he would have lived happily and defined any era."
Anna Wintour and Oscar de la Renta were close friends
The iconic editor-in-chief shared a close relationship with the 82-year-old, and visited him a week with her daughter Bee before his tragic passing.
"The conversation became more serious and he told me he felt he had had the most amazing life and he was not afraid," she revealed. "His last words to me were I love you, and I said I love you back."
The British fashion heavyweight also wrote about the style maestro's gorgeous designs, which have seen him dress style icons including Jackie Kennedy and Audrey Hepburn.
"His designs reflected his extraordinary personality," wrote Anna about the appeal of his dresses. "Optimistic, fun, sunny romantic."
Anna described the Dominican Republic-born designer 'optimistic' and 'funny'
Oscar's last creation was Amal Clooney's breathtaking wedding dress as she married husband George in Venice in September, and Anna, 64, revealed that he had been 'so thrilled to make Amal's dress'.
Oscar's legacy does not just include his designs, but also his close friendships with those around him, including Sarah Jessica Parker and supermodel Naomi Campbell.
"Oscar was everything you could want a friend to be," said Anna.