Senate garb (4)
I believe the answer is:
toga
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">senate garb</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for toga that I've seen before include "Graph's y value" , "Ancient Roman garment" , "Outer garment" , "Roman gents' cloak" , "Garment worn by men in ancient Rome" .)