After all, the huge carnivore strikes an imposing figure with its giant teeth, beady eyes, powerful tail and sharp claws.Product DetailsShow the world how friendly and loving T-Rexes can be with this Adult Barney the Dinosaur Costume. You could go as Barney! Barney the Dinosaur Adult Costume But then inspiration struck! Barney is still one hundred percent T-Rex, so he’s got the sharp teeth (even though they’re always gleaming in a friendly smile) and the sharp claws (even though his arms are only used for hugging).