What are you gonna be for Halloween? They are also used in domes. People always come up to me at conventions and say, “I can’t believe you did this huge costume with your wheelchair.” I love incorporating my wheelchair into my cosplay,’ she continued. The Sanderson sisters make a perfect group of three costumes, but you can stretch it to a group of four with a black cat costume, vision halloween costume or even a Billy Butcherson costume! Many adult black cat onesies are unisex costumes, so whether your squad is comprised entirely of ladies or if you have a man in the mix, you’ll be ready to run amok.