Time to wear exclusive garment (5)
I believe the answer is:
stole
'garment' is the definition.
(shawl-like garment)
'time to wear exclusive' is the wordplay.
'time' becomes 't' (abbreviation).
'to wear' is an insertion indicator (to wear something is to be covered up by it).
'exclusive' becomes 'sole' (synonyms).
't' put within 'sole' is 'STOLE'.
(Other definitions for stole that I've seen before include "cover" , "ripped off" , "Garment; took unlawfully" , "Long shawl" , "Purloined; shawl" .)