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Synonyms for Too Big For One's Breeches (same or very similar meaning)

WordNet sense 1 ((used colloquially) overly conceited or arrogant):
persnickety, snooty, snot-nosed, snotty, stuck-up, uppish, bigheaded

WordNet sense 2 (feeling self-respect or pleasure in something by which you measure your self-worth; or being a reason for pride):
proud


From the ODE community, based on WordNetadd/edit