When Banner transforms into Hulk there's usually some shirt-shedding involved, as  demonstrates. Watches, shoes, belts etc. are similarly ripped off. Yet Hulk always seems to be able to keep his shorts, no matter how much he expands.  Obviously, I can appreciate the pragmatic, out-of-universe reason why the comic creators and the film-makers wouldn't want a starkers Hulk running about. Is there any in-universe explanation for why Hulk rips everything apart from his shorts?  Answers from either the films or the comics are fine (though I confess I'm not at all familiar with the latter).
I guess I can live with the fact that the  changes size drastically when he transforms, but why does his shirt rip off and not his pants?  I think that we need a little better answer than "it keeps us tied to the fact that inside he's still human".
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