Skins

Enter the Gungeon
Alternate costumes are obtained by killing a Gungeoneer's past. There is only one alternate costume for each Gungeoneer, except for the Bullet, the Paradox, and the Gunslinger. The Bullet has two skins (only on PS4 and Switch), while the Paradox and the Gunslinger don't have one. Once a Gungeoneer's past has been killed, a pile of clothes will appear next to them in The Breach, interacting with the clothes while playing as the appropriate Gungeoneer will swap them into their alternate costume. The pile of clothes will then change appearance to appear as the Gungeoneer's standard outfit. Changing Gungeoneers will swap them back into their standard outfit.

The alternate costumes are as shown below.

Exit the Gungeon
Skins, Outfits, Costumes or Vestiments are sold by Snails in the Underbreach after he is rescued in the Gungeon using a key purchased from the Resourceful Rat. These alternate skins can be equipped at Snails' coat rack.

There are two alternate skins for each character. The first skin for each always costs 50, while the second (with the exception of Cooltist) costs 100. The first alt skins are all carried over from Enter the Gungeon, and are unlocked from the beginning, while the second set are all unique to Exit the Gungeon and are unlocked after that character has successfully exited at least once.

After rescuing Snails and unlocking his shop, he will let you take a free costume of your choice.