Makes patterns — all square, of course (3-4)

I believe the answer is:

tie-dyes

'makes patterns' is the definition.

'all square of course' is the wordplay.
'all square' becomes 'tied' (I've seen this in another clue).
'of course' becomes 'yes' (I've seen this before).
'tied'+'yes'='TIE-DYES'

I've seen this clue in The Sunday Times and The Times.

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