Unfashionable garments in city boundary (9)

I believe the answer is:

outskirts

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'city boundary' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'unfashionable garments' is the wordplay.
'unfashionable' becomes 'out' (synonyms).
'garments' becomes 'skirts' (skirt is a kind of garment).
'out'+'skirts'='OUTSKIRTS'

'in' is the link.

Can you help me to learn more?

(Other definitions for outskirts that I've seen before include "borders" , "Suburbs" , "Edges (of town)" , "surrounding area" , "area away from town centre" .)

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

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