A fashionista often follows Western fashion trends and might reference popular fashion capitals like Paris or Milan. John transformed into a fashionista after his trip to Milan.
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Contextual Use
Use 'fashionista' when describing someone with a keen interest in fashion, not just someone who dresses well occasionally. With her extensive wardrobe of designer clothes, Mia is a true fashionista.
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Positive Connotation
'Fashionista' generally carries a positive tone, implying admiration for the person's sense of fashion. Everyone admires Lisa's impeccable taste; she's a real fashionista.