Herald's jacket (6)
I believe the answer is:
tabard
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">herald's jacket</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tabard that I've seen before include "Gilet" , "Jacket worn by a herald" , "Historical tunic" , "Jerkin; heraldic coat" , "Sleeveless jerkin" .)