As Raccoon or Tanooki Mario in World 5-3, tail-attack a Spiny and pick up his shell. Then, keep holding on to the shell as you bash a Goomba in a shoe from below to grab the Kuribo's Shoe. You will have Kuribo's Shoe power, but Mario's lower half will be green and black until you lose the shell. Kick the shell away and the shoe will appear normal, or just wait for the Spiny to wake up to lose the shoe.