Parka or windbreaker (4)
I believe the answer is:
coat
I believe this clue is a double definition.
'parka' is the first definition.
(I've seen this in another clue)
'windbreaker' is the second definition.
(thesaurus)
(Other definitions for coat that I've seen before include "Outer covering" , "Overgarment" , "Jacket" , "Apply layer" , "blanket" .)