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That might be a good feature for kids clothing. This mycelium Sponge Bob onesie grows as you do. Fits ages 5 to 60.

You grow into it then it grows into you…

Reminds me of the joke about a retirement gift for a urologist made of scrotums.

During winter it's a small coin purse, warm it up and you have a briefcase.

That sounds suspiciously like the classic Jewish joke involving a mohel and the question "what do you do with all those foreskins?"