Best clothes (4,4)
I believe the answer is:
glad rags
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">best clothes</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for glad rags that I've seen before include "Special kit" , "Smart clothes (for a special occasion)" , "best suit" , "Best bib and tucker" , "Dressy clothes in happy shreds" .)