School airs off gowns (5)

I believe the answer is:

saris

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'gowns' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'school airs off' is the wordplay.
'school' becomes 'S'.
'off' indicates an anagram.
'airs' anagrammed gives 'aris'.
's'+'aris'='SARIS'

Can you help me to learn more?

(Other definitions for saris that I've seen before include "Dresses worn primarily by Hindu women" , "Garments" .)

I've seen this clue in The Mirror.

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