School airs off garments (5)

I believe the answer is:

saris

'garments' is the definition.
(sari is a kind of garment)

'school airs off' is the wordplay.
'school' becomes 'S'.
'off' is an anagram indicator.
'airs' is an anagram of 'aris'.
's'+'aris'='SARIS'

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

I've seen this clue in The Mirror.

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