In Once Upon a Time: Family Business (2.4) we got not one, but four new fairy tale outfits for Belle, plus one for her mother!
I was unable to find a good photo of the new blue bodice, but this gif is decent. It's basically the same as her original blue dress, just with more princess-y embellishments.
Alas, no good photos of her frilly nightgown!
|From Midstorm's Tumblr|
|From TryingToFindTallahasee's tumblr|
|From Hope2X's tumblr|
|From Spottytonguedog's tumblr|
While it's fun to see different variations of Belle's blue gown, I do wish we could see OUAT interpretations of her pink and green gowns.