Oh dear.
Miss Z the younger found some scissors and gave him a bit of a trim. There was a big pile of fur. Thankfully he hasn't actually noticed, and he had so much fur to begin with that he's not particularly thinning anywhere, just a bit uneven.
When he was a kitten (13 years ago) his previous owner's child trimmed his whiskers because she thought they looked untidy and, again, the silly moggy just let her do it.