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Explanation: Moire is only silk, but 'aguas' can be a 'watery' pattern where one colour is shot through with another and can apply to any material. The Spanish dictionary gives this as one definition (see below)
Dark blue velvet shawl shot through with strands of silver and platinum
9. f. pl. Visos u ondulaciones que tienen algunas telas, plumas, piedras, maderas, etc.'