too big for (one's) breeches

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too big for (one's) breeches

Overconfident in one's importance, skill, or authority; behaving as if one is more important or influential than one actually is. He's gotten too big for his breeches ever since he got that promotion. John's been too big for his breeches now that he's been scouted by the NBA.
See also: big, breech