Christopher's outfit? (3)
I believe the answer is:
kit
I believe this clue is a double definition.
'christopher's' is the first definition.
(short for Christopher)
'outfit?' is the second definition.
('kit' can be a synonym of 'outfit')
(Other definitions for kit that I've seen before include "Old song 'Pack up your troubles in your old . . . bag'" , "tackle" , "Equipment, clothing" , "Apparatus" , "Set of parts sold to be assembled" .)