The boutique's buying director Averyl Oates told Vogue, "The dress worn by Kate sold out almost immediately. Issa is one of our best selling brands and the versatility of the pieces mean that they can be dressed down for the day and dressed up for special occasions." It was on sale for £385 or $616.
But who is Issa, anyway? The label was founded by Brazilian-born Daniella Helayel in 2001. She told Net-A-Porter.com, "It's all about versatility. An Issa dress can be worn from the beach to the office and then onto the red carpet."
We rounded up some looks from Issa's recent runway creations. Check them out and tell us what you think.