Dress bottom (3)
I believe the answer is:
hem
'dress bottom' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hem that I've seen before include "Double-backed border of a garment" , "Finished edge of a piece of cloth" , "Double-backed cloth border" , "Stitched edge of garment" , "Express hesitation" .)