Basque topper
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">basque topper</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 beret that I've seen before include "Soft round cap without a peak" , "Felt hat" , "felt on one's head" , "cover for commandos" , "Soft peak-less kind of cap" .)