birthday suit vs fleece

birthday suit

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

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

fleece

noun
  • Insulating skin with the wool attached 

  • A textile similar to velvet, but with a longer pile that gives it a softness and a higher sheen. 

  • Any soft woolly covering resembling a fleece. 

  • The fine web of cotton or wool removed by the doffing knife from the cylinder of a carding machine. 

  • Mat or felts composed of fibers, sometimes used as a membrane backer. 

  • An insulating wooly jacket 

  • Hair or wool of a sheep or similar animal 

verb
  • To con or trick (someone) out of money. 

  • To cover with, or as if with, wool. 

  • To shear the fleece from (a sheep or other animal). 

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