Definitions for old-hat
banal, commonplace, hackneyed, old-hat, shopworn, stock(a), threadbare, timeworn, tired, trite, well-worn(adj)
repeated too often; overfamiliar through overuse
"bromidic sermons"; "his remarks were trite and commonplace"; "hackneyed phrases"; "a stock answer"; "repeating threadbare jokes"; "parroting some timeworn axiom"; "the trite metaphor `hard as nails'"
antique, demode, ex, old-fashioned, old-hat(p), outmoded, passe, passee(adj)
out of fashion
"a suit of rather antique appearance"; "demode (or outmoded) attire"; "outmoded ideas"
See old hat.