During Chapter 3 of Final Fantasy 7 Remake, you have the option to choose one of Tifa's outfits. Later in the game, she has a choice of an outfit. However, since there are three choices, many players are curious if you can get all three. If you get all nine different costumes for certain characters during the game, you receive an achievement for that.
To get Tifa's three outfit choices in the game, you need to go through this specific chapter and complete it at different times. No, you don't need to restart the game multiple times. You have to play through the Redo at least once, though. After beating the game you unlock the in-game chapter select option and play freely through any part of the game. You can also do this on any difficulty.
When you unlock Chapter Select, you need to go back to Chapter 3, where you have the option to choose Tifa's outfit. Make a different outfit choice, then complete the chapter. There are two more characters that you need to make unique outfit decisions for later in the game. After getting all three different outfits for the character, you can receive the trophy for completing it.
You can repeat any of the chapters on a harder or easier difficulty. You can complete the entire game on the same save file on the hard difficulty of having all your characters reach level 50. It's kind of like a new game mode plus, but it doesn't start you over from the beginning. You can choose to play in any chapter.
