Odd Late Night Thought

How do movie monsters metabolize human clothing? The ones big enough to bite you in half and/or swallow you whole?

I mean, suspend your disbelief to imagine them existing, and that human meat could actually be palatable, but we're wearing clothing. That must taste awful and wreak havoc on the digestion.

Has anyone ever brought this up before? Is there any real-life basis for animals surviving eating clothing (such as sharks and constrictor snakes)?

Discuss.