Simon okay to alter garments (7)

I believe the answer is:

kimonos

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

I don't understand the rest of the clue.

(Other definitions for kimonos that I've seen before include "Wrappers" , "Loose Japanese robes" , "Japanese garments" .)

I've seen this clue in the Sydney Morning Herald.

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