I think Joy looks fine in it. Especially the Aqua and the Champagne. It's the guest (sorry forget her name) who looks like a sack of spuds. Nobody pulls a dress to balloon over a belt anymore. Just guessing but I think her bodyshape, frame and height would suit a much more tailored look and shorter length.
as its a special event ITS ALL ON 3 EASY PAYS
A dress like that needs curves. And by that, no, I do not mean fat.