I made a pikachu costume for my son. I used a hoodie pattern as the base, and added ears tipped with brown cloth. The hood is lined, but I left the rest as one layer to keep it from getting too bulky to wear indoors. 
I put two brown ovals on the back of the shirt for stripes. I used black, red and white felt to make the face. The eyes are slightly smaller circles than the cheeks, and the “glint” is about 1/3 size circle than the eye. I’m not happy with the mouth- I would recommend making a felt smile if you are not proficient in embroidery.
Here’s my son, refusing to show his face for the camera. I hope his dad got some better pictures.
