This was my Halloween costume this year!! I won first place in the costume contest :)
I bought a children's yellow sweatshirt from Salvation Army, then some black and yellow fleece from Walmart. I freehanded my own patterns for the ears and tail, hand sewed them and attatched them to the sweatshirt. Then I bought a pair of white ballet flats from Walmart for like $5, painted them yellow with acrylic paint and gave them black accents with a sharpie.
Then i paired them with black tights and a frilly black skirt I already had, paint red cheeks with cheap lipstick and voila! Instant Pikachu!

The first night, I forgot to add my black nose! It looks much cuter if you don't forget :)