Fold down corner of party outfit (3-3)

I believe the answer is:
dog-ear
'fold down corner' is the definition.
'dog ear' can be an answer for 'fold' (I've seen this before). I am unsure of the 'down corner' bit.
'party outfit' is the wordplay.
'party' becomes 'do' (do can informally mean a party).
'outfit' becomes 'gear' (I've seen this in another clue).
'do'+'gear'='DOG-EAR'
'of' is the link.
Can you help me to learn more?
(Other definitions for dog-ear that I've seen before include "Crease in book page like canine appendage" , "Fold on page's corner" , "Fold down a corner (of a page)" , "Turned-over page corner" , "Hint of shabbiness" .)
