Hooped skirt (9)
I believe the answer is:
crinoline
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hooped skirt</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 crinoline that I've seen before include "Full stiff petticoat worn under a skirt" , "Stiffened petticoat worn to puff out a skirt" , "garment of yesteryear" , "Outstanding skirt" , "Hooped petticoat" .)