Her shop, at its peak, carried her own 'Hattie Carnegie Couture' collection, Paris couture imports from Chanel, Vionnet and Dior, a fur line, her several ready-to-wear lines under different names, a costume jewelry line, a cosmetic line and even a chocolate line.
In 1933, Mona was named "The Best Dressed Woman in the World" by Chanel, Molyneux, Vionnet, Lelong, and Lanvin, becoming the first American to be so honored.