Dorothy bag vs shoulder bag

Dorothy bag

noun
  • A woman’s handbag gathered at the top by a drawstring whose loops are used as a handle; traditionally used by bridesmaids to carry confetti 

shoulder bag

noun
  • Any bag with a single strap designed to be carried on the shoulder. 

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