A girl's denim trousers (5)

I believe the answer is:

jeans

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'trousers' is the definition.
(I've seen this before)

'a girl's denim' is the wordplay.
'a girl' becomes 'jean'.
'denim' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'jean'+'s'='JEANS'

Can you help me to learn more?

(Other definitions for jeans that I've seen before include "boys in France?" , "article of clothing" , "Strides casually" , "Denim trousers" , "(Usually) blue casual wear" .)

I've seen this clue in The Globe and Mail.

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