pullover

/ˈpʊlˌoʊvər/
noun
  1. A knitted garment, typically without buttons or a zipper, that is pulled over the head to cover the upper body; a sweater or jumper.
    • The child's favorite pullover had a picture of a dinosaur on it.
    • She wore a warm wool pullover on the chilly morning.
    • He bought a new pullover with a striped pattern.