baby doll vs nightgown

baby doll

noun
  • A style of women's nightdress. 

  • A young attractive woman; sweetheart, darling. 

  • A child's doll designed to look like a baby. 

nightgown

noun
  • A dressing gown. 

  • A long loose robe worn mainly by women for sleeping in. 

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