birthday suit vs manikin

birthday suit

noun
  • Used other than figuratively or idiomatically: see birthday, suit. 

  • Nakedness, unclothed skin; an exposure of a human's natural anatomy without clothing. 

manikin

noun
  • A little man (sometimes as a term of endearment). 

  • A three-dimensional figure, dummy or effigy representing a man or person. 

How often have the words birthday suit and manikin occurred in a corpus of books? (source: Google Ngram Viewer )