Cap unfinished, female sunbathes in long robes (7)

I believe the answer is:

caftans

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'long robes' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe you can see a link between them that I don't see?

'cap unfinished female sunbathes' is the wordplay.
'unfinished' means to remove the last letter.
'female' becomes 'f' (common abbreviation).
'sunbathes' becomes 'tans' (I've seen this in another clue).
'cap' with its final letter taken away is 'ca'.
'ca'+'f'+'tans'='CAFTANS'

'in' is the link.

Can you help me to learn more?

(Other definitions for caftans that I've seen before include "Long clothes" , "Loose clothes" .)

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

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