foundation garment vs panty girdle

foundation garment

noun
  • A garment designed to hold a part of the body in a particular form. 

panty girdle

noun
  • A type of control garment for women consisting of underpants with a built-in elasticated corset. 

How often have the words foundation garment and panty girdle occurred in a corpus of books? (source: Google Ngram Viewer )