Proper outfit to go with odd hats? (5)
I believe the answer is:
right
'proper' is the definition.
('right' is associated in meaning with 'proper')
'outfit to go with odd hats?' is the wordplay.
'outfit' becomes 'rig' ('rig' can be a synonym of 'outfit').
'to go with odd hats?' becomes 'ht' (I can't justify this - if you can you should believe this answer much more).
'rig'+'ht'='RIGHT'
Can you help me to learn more?
(Other definitions for right that I've seen before include "blue, politically" , "Correct - starboard" , "Equitable" , "Correct; entitlement" , "One has a claim to be correct" .)