Clothes to show off about (4)
I believe the answer is:
garb
'clothes' is the definition.
(garb is a kind of clothes)
'show off about' is the wordplay.
'show off' becomes 'brag' (both can mean to boast about something).
'about' is a reversal indicator.
'brag' in reverse letter order is 'GARB'.
'to' is the link.
(Other definitions for garb that I've seen before include "Fashion of dress" , "Clothe" , "something to wear" , "Dress - habit" , "Distinctive dress of a group" .)