In visual media (TV, movies, theatre, even comics & animation) a character’s costume is an important part of establishing their personality and helping the audience distinguish them from each other. In fiction, things generally have to stand out more and be more exaggerated than in real life.
If characters all dress more or less the same–like, say, they all wear one-colour t-shirts and jeans–it’s probably a deliberate choice (perhaps the director wants to imply conformity, or they feel the characters’ actual personalities are distinct enough that they don’t have to dress so uniquely to stand out).
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