A girl's garments? (5)
I believe the answer is:
jeans
'a girl's garments?' is the definition.
'jeans' can be an answer for 'garments?' (jean is a kind of garment). I am not sure about the 'a girl's' bit.
'girl's garments?' is the wordplay.
'girl' becomes 'Jean'.
'garments?' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'jean'+'s'='JEANS'
Can you help me to learn more?
(Other definitions for jeans that I've seen before include "Denims" , "boys in France?" , "Casual trousers, sometimes stonewashed?" , "Denim trousers" , "Trousers made of strong cotton, usually dyed blue" .)