dress down vs overdress

dress down

verb
  • To wear casual or informal clothes. 

  • To scold. 

overdress

verb
  • To wear clothing which is too elaborate or formal for a particular occasion. 

  • To wear too many clothes for a particular occasion. 

noun
  • Any garment worn over another. 

  • Any dress (feminine-style garment) worn over another, especially over an underdress. 

How often have the words dress down and overdress occurred in a corpus of books? (source: Google Ngram Viewer )