Not have a hair out of place
Definition 1 of 2
Pro Tip 1/3Appear Confident
Using this phrase can suggest someone’s self-assurance, as their appearance is meticulously maintained. 
She walked into the meeting without a hair out of place, exuding confidence.
Pro Tip 2/3Slight Exaggeration
It's often used hyperbolically, meaning nobody’s appearance is literally that perfect. 
Despite the windy weather, he arrived looking like he didn't have a hair out of place.
Pro Tip 3/3Irony or Sarcasm
Sometimes used ironically to emphasize that someone’s appearance is actually disheveled. 
After the rollercoaster ride, her hair was a mess, but he joked, 'Not a hair out of place, huh?'