suspender belt vs suspenders

suspender belt

noun
  • An item of women's underwear consisting of a belt to which are attached suspenders for holding up stockings. 

suspenders

noun
  • Small straps, attached to a suspender belt, that hold up a woman's stockings. 

  • A pair of straps crossing one's shoulders and extending down to one's trousers, where a clip or button arrangement allows them to affix to the trousers, ensuring that they will not fall off. 

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