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Pyjama chopper
Source google image: https://ae01.alicdn.com/kf/HTB1khrXIpXXXXbIXVXXq6xXFXXXa/Adult-Woman-Man-One-Piece-Tony-Chopper-Cosplay-Costume-Onesies-Pajamas-Animal-Suits-Winter-Polar-Fleece.jpg