It’s believed to be a version of Emilia Wickstead’s ‘Anni’ dress.

Her pleated chiffon-crepe midi dress featured a white collar and cuffs.

The original design by Emilia Wickstead, which costs £1,920 but is currently on sale for £768 online, features semi-sheer silk blouson sleeves – something which Kate’s dress did not, however.

Furthermore, the dress cinches at the waist with a matching belt, however it’s not clear whether this was the same as Kate’s look tonight.