become vs get changed

become

verb
  • Of an adornment, piece of clothing etc.: to look attractive on (someone). 

  • To be proper for; to beseem. 

  • To come about; happen; come into being; arise. 

  • begin to be; turn into. 

get changed

verb
  • To change one's clothing (usually for a specific purpose). 

How often have the words become and get changed occurred in a corpus of books? (source: Google Ngram Viewer )