Hooped skirt (9)
I believe the answer is:
crinoline
'hooped skirt' is the definition.
(I've seen this before)
This is all the clue.
(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" .)