overcoat vs surgical gown

overcoat

noun
  • A heavy garment worn over other clothes, for protection from cold or weather. 

verb
  • To apply an exterior coating to. 

surgical gown

noun
  • A protective plastic gown worn by a surgeon when performing surgery. 

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