Crossword Genius

Too unfashionable to go to one's head (3,3)

Ross

I believe the answer is:

old hat

(Other definitions for old hat that I've seen before include "Stale - out of date" , "Dated" , "could be past its sell-by date?" , "Out of date like ancient headgear" , "Past its prime, like ancient headgear" .)

I've seen this clue in the Evening Standard.
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