Isso é discutido no livro " Art of Frozen ".
[Michael] Giaimo is an extremely analytical designer, and when he imagined the costumes for the characters, he applied rigorous aesthetic standards. "For Anna's travel outfit, I wanted something that would be really striking and bold, yet elegant," he begins. "She's a princess, and that really blue skirt says royalty, as does the magenta cape. I thought those two colors would be really striking, because there's a rich saturation to both of them. But there's always a little bit of black on the characters: it helps anchor the saturation, so it doesn't float into the atmosphere."
A paleta verde mais quente foi reservada para Anna enquanto crescia e refletia sua "disposição ensolarada". Obviamente, a ponto de o filme mudar de roupa, sua disposição é um pouco mais reservada.
