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Adjective: too big for one's breeches
Usage: informal
  1. Overly conceited or arrogant; showing or characterized by a superior, disdainful, or haughty attitude
    "they're snobs—stuck-up and uppity and too big for one's breeches";
    - bigheaded, snooty [informal], snot-nosed [informal], snotty [informal], stuck-up [informal], uppish [informal], pernickety [Brit, informal], snobbish

See also: proud, toffee-nosed [Brit, informal]