Outerwear (4)
I believe the answer is:
coat
'outerwear' is the definition.
(I have seen 'Warm outerwear ' mean 'coat' so perhaps 'outerwear' could also mean 'coat')
This is all the clue.
(Other definitions for coat that I've seen before include "Layer of paint" , "Apply layer" , "Fleece" , "blanket" , "Outer covering" .)