fanny pack vs trouser

fanny pack

noun
  • A small fabric pouch secured with a zipper and worn at the waist by a strap around the hips. 

trouser

noun
  • A pair of trousers. 

  • Of or relating to trousers. 

verb
  • To secretively steal (an item or money) for personal use. 

  • To put (money) into one's trouser pocket; to pocket. 

  • To take and keep (something, especially money, that is not one's own); to pocket. 

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