Still not a ME, as it's not a mass "false memory." Again, the color of the dress in the source material has never changed. It has always been a pale silvery-blue reminiscent of the moon, and it has always appeared more of a true blue in various lightings.
If you look at the cover of the Cinderella Little Golden Book, she's depicted with the movie-accurate dress and hair. In this screenshot from the transformation scene, you can clearly see the original color of the dress, as well as her hair. Meanwhile, if you look at this screenshot from the famous ball sequence, you can see that the lighting makes her dress appear blue; it's obviously a trick of the lighting, as Prince Charming's entire palette has darkened, as well, from this neutrally-lit screenshot, aka his true design.
As has been mentioned already, Disney chose to market the dress with the blue palette seen in the ball sequence linked above. This has been perpetuated since, and only in the original animated film do you see the dress's true, legitimate color. Even the live action remake of Cinderella features a vividly blue dress, as Disney wants to stick with the image they've created and perpetuated.
great story katie loves this crap!