Band worn over the shoulder (4)
I believe the answer is:
sash
'band worn over the shoulder' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sash that I've seen before include "Decorative band" , "Strip of cloth worn round the waist" , "Style of window" , "Decorative belt" , "Window frame; cloth strip (worn over shoulder)" .)