Can a human-sized organism survive eating only textile fibers?

Since there are living beings (like moth larvae) which feed on textile fibers (wool, cotton, silk, et cetera), I was planning to introduce a human-sized creature with such feature, plus the ability to feed on artificial fibers as well.

Said creature should have a life cycle of at least 20-50 years, should feed exclusively on textile fibers, and would need about the same energy as a human being (~1500-2000 kcal/day).

If hard-science fail in this case, even an "handwavy-but-interesting-solution" on the creature's supposed biology goes ;)

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Can a human-sized organism survive eating only textile fibers?

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