Bought for my daughter a few weeks ago whilst keeping several outfits including one for school. She is 5 years old, about 44-45cm tall, weighs about 44 pounds and I bought a size 6. It fits very well, not too big and not too small. - The material of the shirt is on top and not very thick, but it's exactly what I expected. Probably overpriced for the material, but you're paying for the Frozen II and Disney branding. Considering I've seen the Frozen II dress in a store for over $50, the price here doesn't surprise me at all.
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