Possibly paper trousers? (4)

I believe the answer is:

bags

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for bags that I've seen before include "Items of clothing" , "things" , "fashion accessories" , "Holdalls" , "a great deal" .)

I've seen this clue in the Evening Standard.

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