Why do many girls need to constantly buy new clothes?

Most girls have a full wardrobe of clothes they can wear, so why do they feel a need to constantly buy new clothes? Some girls say that it's due to fashion, but fashion doesn't change every week and many girls go to clothes shops every week and also fashion is just a way how to trick people into buying stuff they don't need. What's wrong with just using clothes you already have?
Why do many girls need to constantly buy new clothes?
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