Sportcoat flap (5)
I believe the answer is:
lapel
'sportcoat flap' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lapel that I've seen before include "Turnover at the front of a coat" , "Feature of a jacket" , "Lower part of collar on coat" , "top of coat" , "Fold of coat" .)