Some superheroes' accessories (5)
I believe the answer is:
capes
'some superheroes' accessories' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for capes that I've seen before include "may be worn" , "Short cloaks" , "Space for cloaks" , "Sleeveless cloaks - promontories" , "Cloaks or headlands" .)