Old Hat Meaning

(idiomatic) Something with which one is very familiar; something very common, hackneyed or out of date. [from 20th c.]

Example: 1723, Charles Walker, Memoirs of Sally Salisbury, VI:
  if the Pedantick Blockhead should come, he should only have a little bit of Old-Hat to stay his Stomach, till he got to some Harlot of his own Puritanical Flock, for his Money [...].
1980, Erica Jong, Fanny:
  'Tis a Nest, a Niche, an Old Hat, an Omnibus, an Oyster, a Palace o' Pleasure.
1946, "New Plays in Manhattan," Time, 11 Nov.,
  Coward is such an old hand at this kind of thing that he makes it seem old hat.
1987, Elaine Sciolino, "Washington Talk: The Hart Story Grips the Capital," New York Times, 8 May (retrieved 21 June 2008),
  It is old hat for a sex scandal to bring down a politician.
2007, Fredrick Kunkle and Paul Duggan, "Straining for a Glimpse of Royalty," Washington Post, 4 May (retrieved 21 June 2008),
  Based on the size of the crowd, perhaps the queen is old hat.