How do you use alternate costumes?

Looking at the wiki page for any character, they show the sprites for the character in an alternate costume. How are these used or unlocked?

1 Answer

To use an alternate costume, you first have to beat the game with that character by killing your past.

Once you've done that, the alternate costume will be lying said character when you choose them at the start of the game. You can just go and use it to switch to it.

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