You can find all sorts of animal costumes in stores, but they can be expensive. Make one yourself out of clothes and other objects you already have. For example, to make a bunny costume:
Start with a solid brown outfit, socks, mittens and cap.
Hot glue cotton balls to the back of the outfit for a tail.
For ears, cut two triangle shapes from brown paper and glue to the cap.
Tip: Use any solid color outfit you have available to create different types of animal costumes.