outerwear vs overcoating

outerwear

noun
  • Clothing (such as a raincoat) worn over one's clothes when outdoors. 

  • Clothing (such as a dress) worn over one's underwear. 

overcoating

noun
  • cloth for making overcoats 

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