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These adorable Elsa and Anna Sparkle Princess Dresses will fit an American girl doll.
Ebuddy ® Elsa and Anna Sparkle Princess Dress Fits 18 Inch Girl Doll
The set with the Elsa and Anna dresses in is available for $40.99 with Free Shipping on Amazon Prime. If you just want to buy the Frozen Anna Sparkle Princess Dress 
Both dresses are beautifully detailed and you know that this will be your little princesses favorite American Girl dress for her doll. Each dress has 3 pieces and is very detailed – a great buy for around $20 for your Frozen fan.