There was a size 18 just now when I clicked the link!
It’s a lovely dress and totally suitable for the occasion, can also be worn to any other summery event as it’s not too formal.
I will say though, I like the look of loads of NC dresses but I have terrible trouble getting them to fit me properly in the right areas. I’m currently a 12-14 in most other shops but I’ve got around 5 ND dresses in bigger sizes because the bust area of the dresses are tight otherwise!