The Wario Cap (or Wario's Cap) is Wario's traditional headwear. The hat is yellow, with a large blue "W" emblem inside a small white circle and a white rim. It has been featured in every Wario Land game, and many other appearances of Wario elsewhere (a notable exception is its absences in the WarioWare series, as Wario wore a biking outfit in that series, instead of his classic clothing).
If Wario loses in Mario Kart 64 and Mario Kart: Super Circuit, his profile picture will show him biting his cap. This is possibly a reference to the idiom "I'll eat my hat" which is used to express strong disbelief.
In Super Mario 64 DS, Wario's Cap can be found and worn by either Mario, Luigi, or Yoshi to transform into Wario. Until he is unlocked, the only course his cap appears in is Hazy Maze Cave. If Wario loses his own cap, his defense and strength will sharply decline, and he is unable to pick up other characters' caps or turn into Metal Wario. If the player collects a star while the cap is still missing, Wario can retrieve his cap by talking to Toad, who will have found and be wearing it. Toad says the cap "reeks pretty bad" and suggests that Wario should wash it out more often.
The Wario Cap can be obtained for Mario to wear in Super Mario Odyssey. It can either be purchased from a Crazy Cap store or obtained through scanning a Wario amiibo (the latter also unlocks Wario's costume).
The Wario Cap has not always been its classic yellow as seen in most of the games Wario appears in. In some segments of Wario's Woods his cap appears purple, although in the SNES version, his cap appears yellow. In Wario Land II and Wario Land 3, the Wario Cap is depicted as white in-game. In Super Mario Land 2: 6 Golden Coins and Wario Land: Super Mario Land 3 his cap was gray due to the monochrome display of the Game Boy. In Wario Land 4, his cap is depicted as yellow like his official artwork.
The cap has also been imitated on different headgear Wario has worn. Wario's WareWare helmet is in the style of his cap with the white rim and blue "W" emblem. Wario's safari hat from Wario Land also has his signature blue "W" emblem.
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