Frill (4)
'frill' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ruche that I've seen before include "Piece of lawn" , "frilly stuff" , "Pleated gathering of fabric" , "Fancy border" , "Frill/pleat of fabric" .)
'frill' is the definition.
(a ruff is a frill worn round the neck)
This is all the clue.
(Other definitions for ruff that I've seen before include "Eurasian sandpiper -- Australian fish" , "Fish; neck frill" , "Starched frill; fish" , "Win a trick by using a trump" , "High tight collar" .)