knitwear vs sweatshirt

knitwear

noun
  • knitted garments 

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 knitwear and sweatshirt occurred in a corpus of books? (source: Google Ngram Viewer )