Custom-made outfit (5)
I believe the answer is:
habit
This clue is a double definition.
'custom' is the first definition.
(habit is a kind of custom)
'outfit' is the second definition.
(thesaurus)
'made' is the link.
(Other definitions for habit that I've seen before include "It's second nature" , "bent" , "Settled tendency" , "Custom or monk's robe" , "Monk's gown or custom" .)