It's actually historically likely. Even up to the 1950s, believe it or not, it was common for vulnerable people- children especially- to be sewn into woolen undergarments, presumably with strategic holes, to keep them warm for winter. And presumably smelly and lice-ridden too.
References:
Deary, T., "The Woeful Second World War"
Magorian, M., "Goodnight Mr. Tom"