I watched Frozen yesterday with my two nieces, despite being set in Scandinavia and inspired by an HC Anderssen tale it didn't get to Sweden until now. Anyway I was totally awestruck by the costumes in the film. For the first part I just sat there gaping and thinking about how I would be able to recreate them. I definitely think Frozen is something new when it comes to attention of details on animated costumes, and I would recommend reading this interview with the costume designer Jean Gillmore. I loved the colours and how they mixed elements of the Norwegian bunad with fairytale fantasy fashion.
The bunad is broad term for Norwegian folk costume. It actually evolved in the 19th century when when national romanticist wanted to revive traditional folk customs and clothing. I'm from Sweden so I don't really know the story about the bunad, and if it's similar to the history of the Swedish folk costumes.
The main problem as usual would be to fix the hair ad the little tiara.
As for wearing it. Well that is the problem, and I usually don't like to make costumes that I can't wear. he HSF has a challenge for alternate universe due around Halloween, and this would definitely fit that. I could also bring it to the annual sci-fi con in Stockholm in early December.