A true vintage dress from Shubette of London, a brand founded in 1913. The same label was found on their 60s productions.
You need to tie the bow on the front, so the chest is relatively free. Measurement at the start line of the white part(just below the chest) is about 70cm.
The dress is in very good vintage condition. There are two stains on the white part, but as you can see they are not obvious because of the painting-like design.
Seen on size 38.