You can obtain Outfits with Battle Points (BP) by buying Soldier’s Crates.
If you wish to purchase Soldier’s Crates and have earned enough BP, you may do so with the following steps:

1. Tap on [Shop] on the center right side of the lobby screen.
2. Tap on [Crates].
3. Scroll down to the [Soldier’s Crate] and Tap on [Open once].

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