Garrett's itch affected knitting style (6,6)

I believe the answer is:

garter stitch

I'm a little stuck... Click here to teach me more about this clue!

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

'garrett's itch affected' is the wordplay.
'affected' is an anagram indicator.
'garretts'+'itch'='garrettsitch'
'garrettsitch' anagrammed gives 'GARTER-STITCH'.

Can you help me to learn more?

(Another definition for garter stitch that I've seen is " Plain knitting method".)

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

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