If you don’t want to go the traditional route in dressing up as one of the main characters from Toy Story, then this Rex costume could be something to consider. It’s very easy to put together and takes very little to no effort to do either! The one thing you’ll really need is the Rex mask. Other than the mask, you can just wear green clothing from head to foot and you’re done! Just make sure that your clothing matches the shade of green of the mask. Be sure that the chest/belly portion of your shirt is a lighter shade of green from the rest of your shirt.