knitwear vs waistcoat

knitwear

noun
  • knitted garments 

waistcoat

noun
  • An ornamental garment worn under a doublet. 

  • A sleeveless, collarless garment worn over a shirt and under a suit jacket. 

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