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 pro teams.
See also: big, breech
References in periodicals archive ?
Emma used to chant, "Brush your teeth, do your homework, make your bed, don't get too big for your breeches, pay no attention to the photographers in the bushes",' laughs Kate.