I don't have a clue about a pattern for it, and I wish they said something about her outfit's materials like they did the prince. Maybe you can use suede for that as well?
I mainly stopped by to give you thumbs up for wanting to cosplay Snow! I just finished the series myself. X3 Good luck!
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Art Critic Rarity - MLP:FIM
Alucardalina Claire - Guild Wars 2
Eirin - Touhou