The way to unlock each character's clothing is to open it once in any game mode and at any difficulty, and unlock one clothing in turn. Repeat this mode with the same difficulty and you can't continue to unlock it. For example, playing arcade mode, simple difficulty clearance can unlock a thing, but repeated playing is useless. You must play ordinary and other difficulties, or go to time mode or survival mode to play simple difficulties. If it is a double mode, each person can unlock one at the same time.

Special clothes, such as Christie's swimsuit, need other methods, such as getting through a difficult survival mode at once.