Don’t change that boy’s hats (8)
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I believe the answer is:
stetsons
'hats' is the definition.
(Stetson is an example)
'don't change that boy's' is the wordplay.
'don't change that' becomes 'stet' (I've seen this in another clue).
'boy's' becomes 'son's' (male child).
'stet'+'sons'='STETSONS'
(Other definitions for stetsons that I've seen before include "Cowboy hats" , "Hats for Texans" , "Hats for Texan oil magnates" .)