Cinderella

I watched the film "Chinderella" with my two daughters. I was so moved by it to it so much.
Why is the colour of the dress which Cinderella wears clean blue, and not white?
I was thinking about the reason after watching the film yesterday and an idea struck me light bulb went off for me this morning.
Blue is bluethe colour of the beautiful earth and the symbol of water. We could feel relieved to see the ocean.
That is why we must have been inspired by blue of the Cindrella's blue dress on the screen moves and inspires us.