The dress is called the Flippy Wiggle Dress and costs £1,850.
The Duke and Duchess of Cambridge Twitter account posted: “The Duchess of Cambridge has brought together 19 British brands and retailers to donate over 10,000 new items to more than 40 baby banks across the UK.”
Fans poured in with their praise. One wrote: “Brilliant collaboration! So proud of the duchess! Fantastic work for a worthy cause
Another said: “Well done Kate!!! We are so proud of you and all the work that you do. What an amazing program this is.”
“Amazing as always Your Royal Highness,” another said.
“This woman is just so amazing and always doing a wonderful job. It’s always a pleasure to see her so involved in her work Smiling face with heart-shaped eyes. I love her so much,” one wrote.
READ MORE: Kate Middleton’s £1,300 dress honours Canada as she and William make royal tour promise