OK, so. I have been stalking the dressups gallery for this theme, and so far I have found no dressups inspired by "Let It Go", surprisingly.
I know, this is a bad dressup. But I don't have to many items, sadly!
Anyway I'll talk you through it. The cobwebs and other stuff near the dog's paws represents snow/ice coming from Elsa's hands. The dress and sash represent her dress, and the strange snowman represents Olaf.
I don't actually like the song, but, I was recently given the dress, which is on the dog, and you know, why not? It's a classic Xp