A costume is just as important as the hero who wears it, iconography wise, and where they get their outfit can add significant depth to their story. Superman's costume was left to him by his parents, or made for him by his adoptive parents, or one of several other variations on the whole parental legacy jive. Batman pieced his armor together as he grew to be the symbol Gotham needed.
Aquaman, on the other hand, was out on a field trip to Jurassic Park taking a dead guy's MacGuffin and figured "eh, while I'm here, might as well nab his threads." Yes, the protagonist of the franchise went grave-robbing and, unsatisfied with just a weapon capable of commanding the seas themselves, also thought he should try a new look.
Nobody's arguing that Aquaman's costume has the instantly recognizable quality as some of the other DC A-listers, so maybe it doesn't matter where he got it. It's just that it'd be kind of a turn-off if Indiana Jones got his hat out of a particularly jazzy dead knight's tomb and kind of just kept it forever.
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