The Duchess then made her official return from maternity leave to make a speech outside of Smart Works. She wore two pieces from the collection - the Jigsaw black pants and Misha Nonoo white shirt, as well as butterfly earrings and a bracelet that reportedly belonged to Princess Diana.
The collection – which features a shirt, pants, a blazer, a dress and tote bag – will be on sale for two weeks starting today with one piece donated to Smart Works for every one sold.
Below, the three pieces that are already available to shop. You can't feel guilty when it's for charity, after all.
Marks & Spencer Crepe Shift Dress, $35, Marksandspencer.com
John Lewis Smart Set Tote Bag, $195, Johnlewis.com
Jigsaw Paris one button jacket, $357, Jigsaw-online.com