Jacket accessory ought to drape differently (8,3)
I believe the answer is:
shoulder pad
'jacket accessory' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'ought to drape differently' is the wordplay.
'ought to' becomes 'should' ('you ought to' means 'you should').
'differently' indicates anagramming the letters.
'drape' anagrammed gives 'erpad'.
'should'+'erpad'='SHOULDER PAD'
Can you help me to learn more?
(Another definition for shoulder pad that I've seen is " something to put over a joint".)