Last May, when we had breakfast at CRT, Belle was there in her blue & white dress. When we had dinner at PSB (Norway), she was also there in her blue & white dress.
However, I've read some recent reviews where she's been in the lobby at PSB in her gold dress.
(I think the gold dress is so wide that it makes it difficult for her to move between the tables at the restaurants if she's wearing it.)
Additionally, I think she & the Beast can sometimes be found in France of the World Showcase pavillions, and she may be in her gold dress there.