There is the following sentence in Tina Fey’s “Bossypants":
”Don Fay dresses well. He has an artist’s eye for mixing colors and prints. He wears tweedy jackets over sweater vests in the winter and seersucker suits in the summer. His great college ring shows off his well-groomed hands. He can still rock a hat. - P43.”
I don’t understand what “He can still rock a hat” means.” Neither of CED or OED carries “rock a hat” as an idiom. Nor GoogleNgram does.
What does it mean? Is this phrase Tina Fey’s coinage?