This kigurumi wolf onesie is an all-in-one wolf costume in adult sizes. Being a comfy onesie, it can also be used as pyjamas.
The hood represents the wolf's face, and includes wolf eyes, fangs and other details. The rest of the onesie outfit is the wolf's body, with a white belly at the front and a tail at the back. It also has a drawstring hood and pockets.
These comfy all in one animal costumes are known as 'kigurumi' in Japan where the craze originates. Kigurumi means 'a soft toy that you wear'.