cardigan vs sweatshirt

cardigan

noun
  • A type of sweater or jumper that fastens up the front with buttons or a zipper, usually machine- or hand-knitted from wool. 

sweatshirt

noun
  • A loose shirt, usually made of a knit fleece, for athletic wear and now often used as casual apparel. 

  • A shirt worn against the skin, usually under other clothing, to absorb sweat. 

How often have the words cardigan and sweatshirt occurred in a corpus of books? (source: Google Ngram Viewer )