Caesarean garb (4)
I believe the answer is:
toga
'caesarean garb' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for toga that I've seen before include "Roman raiment" , "Got a robe for an old Roman" , "Ancient Roman garment" , "Got a cloak for an old Roman" , "Outer garment" .)