In Final Fantasy 7 Remake, you’ll need to unlock three dresses for each Tifa, Aerith, and Cloud, in order to get the PlayStation "Dressed to the Nines" trophy. To do this, you’ll need to replay the game multiple times, completing various side quests along the way.
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FF7 Remake Guide: How to Get All the Dresses for Tifa, Aerith, and Cloud - IGN
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Chapter 3 - Home Sweet Slum - Final Fantasy 7 Remake Guide - IGN
FF7 Remake Guide: How to Get All the Dresses for Tifa, Aerith, and Cloud - IGN
Sephiroth, Final Fantasy Wiki
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