She made it for him from his blankets which are as indestructible as he is.
So the first time it does get damaged, like here for example:

He's absolutely screwed because there's no more indestructible thread. Not to mention the fact that it is an unbelievable coincidence that his childhood blankets have the exact right amount of thread to make a fully grown adult Clark's Superman costume. And if we're going with that origin, where the hell do his boots and belt come from?
Its a quaint origin, but I don't think it works anymore the way it was originally presented. It could be like in the Captain America movie though where Ma Kent designs the first costume but that one gets all banged up and S.T.A.R. Labs volunteers to make his second high tech one. That could work.
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