Ceremonial garments pinched duchess's rear (6)

I believe the answer is:

stoles

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'ceremonial garments' is the definition.
'stoles' can be an answer for 'garments' (stole is a kind of garment). I'm unsure of the 'ceremonial' bit.

'pinched duchess's rear' is the wordplay.
'pinched' becomes 'stole' (pinch can mean to steal).
'rear' suggests the final letters (the back of the word).
The last letter of 'duchesss' is 's'.
'stole'+'s'='STOLES'

Can you help me to learn more?

(Another definition for stoles that I've seen is " Wide scarves".)

I've seen this clue in The Independent.

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