Honestly my favourite banquet dresses so far have been:
which I know a lot of people hated, but was interesting, a nice colour and a great fit. It was a total 80s revival and I loved it in retrospect. The jewellery was great, too. Pearls, pearls and more pearls!
(yep I know this one was worn in Norway, but it was princessy and moved beautifully)
The others have been too plain (if a nice colour):
Pretty, but a bit juvenile:
Again, pretty but fluffy and that exact shade of white is kind of harsh on her