Detta diskuteras i boken " 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."
Den varmare gröna paletten var reserverad för Anna när hon växte och återspeglade hennes "soliga disposition". Självklart vid den punkten i filmen som hon bytte kläder är hennes disposition något mer reserverad.
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