It's worn by a woman for a dance (6)
I believe the answer is:
bolero
'for a dance' is the definition.
(bolero is a kind of dance)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for bolero that I've seen before include "Dance -- work by 9" , "Maurice Ravel's most famous work" , "what Ravel wrote" , "Kind of jacket or dramatic music by Ravel" , "Upper garment or music piece by Ravel" .)