I made Pooh and Piglet costumes one year for my children when they were young. This could be adapted to any of your favorite bears.
Parental supervision is recommended.
This project is rated EASY to do. How To Make It Cut 4 triangles out of the felt that are the appropriate size for ears. Sew two together, leaving the bottom open, and then turn right side out. Pinch into the stocking cap and sew onto the hat from the inside. Put the yellow sleeper or sweat suit on your child and place the red tee shirt on over it.