You’re too smart for your own britches

This wonderful congruent conflation is a mash up of  “you’re too smart for your own good” and “too big for your britches”, both describing a haughty person.  This is a fairly common malaphor, evidenced by the amount of internet hits using this phrase.  Contributing to the confusion is the use of the word “too”.   Thanks to Sheva Gunnery for hearing this subtle mix up and passing it on!