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https://en.wikipedia.org/wiki/Capacity_(law) It's a very general legal principle, so how it applies varies jurisdiction to jurisdiction (and probably case by case since it may not be codified clearly). Look under infancy, and minors and contractual capacity.

Chances are, a dealership won't sell a car to someone <18 for this reason. Used car/private sellers are taking a big chance if they do.

He said except life necessities, which a shirt probably is part of.

You wouldn't be able to come back more than depreciated value. Minors aren't permitted to destroy stuff for free.