bedgown vs pyjamas

bedgown

noun
  • An article of women's clothing for the upper body, usually thigh-length and wrapping or tying in front; a bedjacket. 

  • A nightgown. 

pyjamas

noun
  • Britain standard spelling of pajamas (loose trousers worn by men and women in South Asia). 

  • Britain standard spelling of pajamas (clothes for sleeping in). 

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