Giddyup, T-Rex! While I'm not so sure about the proportions of this inflatable dinosaur costume, what it lacks in mathematical accuracy it definitely makes up for in costume originality. Now riding into your Halloween party, or 10-year high school reunion, on the king of the Cretaceous period isn't just possible, it's lightweight, relatively cheap, and unlikely to get anyone maimed or killed!
Made of terylene, the same material used for parachutes, Big Kid Costumes' T-Rex for cowboys is fan-operated to maintain inflation, and fits most riders 5'0" to 6'7" tall. Included fan units have low-profile battery packs that clip to pants or belts, and run for "several hours of excitement" of 4 fresh AA batteries.