Talk about right clothing (4)
I believe the answer is:
garb
'clothing' is the definition.
(I know that garb is a type of costume)
'talk about right' is the wordplay.
'talk' becomes 'gab' (I've seen this in another clue).
'about' indicates putting letters inside.
'right' becomes 'r' (common abbreviation).
'gab' enclosing 'r' is 'GARB'.
(Other definitions for garb that I've seen before include "Distinctive dress of a group" , "Dress - clothing" , "gear discovered" , "Dress - habit" , "something to wear" .)