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I fail to see any chainmail in that gown.

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Mail (chain mail, maille) is a type of armour consisting of small metal rings linked together in a pattern to form a mesh.

I think that gown is Gold Lamé.
Lamé is a type of fabric woven or knit with thin ribbons of metallic fiber,

If it were chainmail, moochelle wouldn't be able to stand up due to the weight.