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Sometimes metal parts will sort of wear down over time. The only thing you can do is replace the snaps (both) with new ones, but may be difficult to do unless they're the sewn in kind. The riiveted kind is put in with some kind of machine or plier type tool. If it's a good shirt, may be worth it to take it to someone that alters clothing or a tailor, however, not everyone will be able to do it or want to do it. __________________
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Snap on snap up shirt no longer fits? 
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