Hever seen the old movie, but i had Disney book when i was young ... and they were blue there aswell. O_o Also ... cant Disney retcon in their own movie kinda whatever they want?
Fact is that in the original movie her dress was silver or trying to be as "glass/crystal" as animators could make it. But when they later released wares related to the movie, like toys etc they changed her dress to a light blue as it was easier to produce and they were afraid a silver one would look like a white whedding gown.
So yes Rag, ofc they can. They can also stop making movies and move into the flower business if they want. Just like Larian can remove functions in dialogue in BG3, a decision which I remember you personally wasn't a big fan of. So what's your point, I'm not allowed to have an opinion or voice it?